The guy was convinced there's an organised Marxist agenda actively working in western society to distort truth and keep its citizens in the dark. This will just vindicate his claims in the eyes of anyone who was willing to buy it.
And lets face it, the originals are going to be around a lot longer than the Anonymous spoofs because these kids are going to get bored and move onto something more interesting by next week/month/whatever. They can't outlast someone festering in hatred for years.
A concerted censorship effort by anyone is the worst thing that can happen to the internet. No matter how righteous you feel your cause (of course everyone feels theirs is). Simply, the only way for wayward ideas to be uprooted is to expose them to the full light of scrutiny. Pushing them into dank corners, veiled by mystery, away from public discourse, will always find fertile ground in minds of individuals on the fringes searching for someone to blame for their woes.
At the very best this is misguided cowardice.