Links to the relevant videos are provided. However, as aging comments are shifted across to subsequent pages, it may become quicker to Google the phrase.
For the record, the screenshots shown below were taken around December 21-23, 2012. The gh987t879 operator's anti-Truth posts tend to precede his relatively recent pro-Truth posturing, but here are a series of anti-Truth posts showing "5 hours ago" as of 1700 UTC on December 23, 2012.
Amusingly, gh987t879 is suggesting there that Truth activists think the collapse videos are fake, whilst only a couple of days previously - as shown below - gh987t879 was claiming that the government "faked" the TV plane crash videos, and suggested that only retards who'd been "duped" by the government and mainstream media would fail to see that the collapse videos were also fake. (Those screenshots were taken a couple of days previously, and so the post shows up as "hours ago".)
And here's one from "1 month ago", thus November or late October 2012.
Even by the standards of those who defend the official conspiracy theory, gh987t879's anti-Truth comments are very unsophisticated. Rather than presenting any actual evidence or rational argument, he'll resort to insults. Here for example, in anti-Truth mode, the operator alleges that "truthers are idiots".
And, according to gh987t879, the architects, structural engineers, PhD scientists, etc., at AE911Truth are "faggots".
However, this "anti-truth" operator made the mistake of using the same account to peddle the "no planes at the WTC" absurdity, inadvertently providing proof that anti-Truth shills pose as pro-Truth nutjobs with the aim of discrediting 9/11 Truth. (As we shall see, it's not as if he doesn't have any other YouTube accounts to choose from!)
Hilariously, gh987t879 pretends (on the same thread as above) to be a pro-truth activist, concerned that fellow activists who don't buy into the no-planes lunacy are going to "stir confusion among potential new truthseekers". What's more, he inverts reality by pretending that the real truth teller is a "shill" who is playing "PsyOp games".
Gh987t879 made an interesting comment on a music video, naming Strategic Communications Laboratories, a company headquartered in London whose clients include governments and the military, and which specializes in manipulating people by applying its "Methodology to change the behavior of individuals, groups and even governments by confronting or reorienting the existing behavioural misalignment." Some YouTube shills are suspected of working for SCL, but in general, the shills operating on YouTube are so inept that it is doubtful that anyone would pay them to post their comments.
The infamous "debunker" ctcole77, suspected by some of working for Strategic Communications Laboratories, described gh987t879's YouTube channel as "awesome".
Gh987t879 claims to have obtained a Truth advocate's personal details, and tries to discourage other truth tellers by threatening to obtain and expose their personal information.
When posing as pro-Truth, gh987t879 promotes other absurd nonsense such as Judy Wood's WTC-destroyed-by-direct-energy-beam-weapon disinformation.
(Actually, it was Einstein who ridiculed "spooky action at a distance", and the matter was only resolved by Hugh Everett III in 1957.)
Another YouTube account operated by gh987t879 is UnitedChildrenOfZion. The actual channel has been made unavailable, but the title reveals who orchestrated 9/11 and is in charge of the cover-up. UnitedChildrenOfZion poses as a WTC-was-nuked nutjob. From the similarities in writing style, such as use of the phrase "your fat fucking walrus brain" and typing "RETARD" on a final line, it can be seen that both accounts are run by the same operator.
Source (above and below images)
Also notice how UnitedChildrenOfZion again pretends to be a diligent truth activist who is afraid that those who don't buy into the "nukes at the WTC" baloney will "ruin the truth movement". The operator's true allegiance has already been revealed by the choice of name for the account, and, of course, he and his associates post such comments because they desperately need to "ruin the truth movement". Possibly the original intention was to use this account to attack Truth activists, and to use other accounts to pose as a pro-truth nutcase, and it went pear-shaped. But there's more. Evidence in the form of writing style showing that UnitedChildrenOfZion is gh987t879 is corroborated by a statement by the latter:
"Zionism will save us, shalom."
The idiot forgot to delete his message, in which he not only revealed his allegiance to Zionism, but also gave away details of his Tribe's tactics such as spamming comments and voting at YT.
When gh987t879 posted on a video made by a very smart Syrian lady, he confirmed that apart from attempting to cover for Israel's central role in 9/11, he was promoting the Zionist line on issues quite apart from 9/11. The video maker had suggested that the film insulting the prophet Mohammed was intended to divide Muslims and Christians, amongst other things. Gh987t879 called her a "retard".
Here's another of his YT accounts: OliverTerrance. Note the use of the phrase "your fat fucking walrus brain", and, similar to UnitedChildrenOfZion, the "HMMMMMMM. RETARD".
Sometimes UnitedChildrenOfZion and OliverTerrance will appear in the same thread, peddling the same disinformation. Some cases may be a result of the operator being too stupid to remember which of them he was supposed to be...
However, on this occasion, it was a deliberate use of a sock puppet to make it seem as if his position enjoyed more support. As we continue to read down the thread, we see that just in case two people weren't enough, he brings out another of his sock puppets: g6rdug7i.
In the comments shown below, it is seen that g6rdug7i promotes WTC-was-nuked and no-planes, and, in common with gh987t879 and UnitedChildrenOfZion, "inverts the accusations" by pretending that genuine Truth activists are "disinfo agents posing as truthers", and the disinfo agents peddling the nonsense about nuclear devices are the real "truthers".
G6rdug7i sometimes combines several brands of lunacy in a single comment, although his tactics are all too transparent.
In his OliverTerrance profile, this Zionist tool claims to be 16 years old. The content of his postings from his multiple accounts show that he is obviously very immature, ignorant of 9/11 and of science, and is hardly the sharpest tool in the box. As shills go, he is one of the least educated, the least articulate, and the least intelligent. Nevertheless, it looks as if he's received some basic training on various tactics that even a borderline retard can use to attack anti-Zionist truth tellers, from calling them names and threatening them, to confusing the newcomer by posing as an anti-Zionist who believes crackpot conspiracy theories and pseudoscientific drivel.
The tactics serve to poison the well and make it seem like it is still debatable whether or not Israel was the principal perpetrator of 9/11 - when evidence proving Israel's central role in 9/11 has existed for years and is now proven beyond any shadow of doubt, any normal person of reasonable intelligence will be capable of evaluating the evidence and concluding that Zionists orchestrated 9/11, and structural engineers, architects, physicists, mechanical engineers, metallurgical engineering graduates, PhD scientists, fire protection engineers, fire-fighters, electrical design engineers, explosives technicians, psychologists, judges, etc., know that the government's 9/11 conspiracy theory of Arabs with box cutters is as credible as a claim that Elvis was abducted by aliens last week. But it would make sense for the 9/11 perpetrators to use propagandists who were stupid enough to believe in their own rhetoric. It lends them a certain sincerity, if nothing else.
Note: The possibility that the gh987t879 operator is female can be discounted on account of the foul language used.
See here for information on YouTube chief 9/11 "debunker" Merlin5by5, the child porn convict and client of a midget hooker.