I think you are the one who is naiive here. Anarchists are not a peaceful bunch. They have done some horrible things for their cause. Are you telling me these are peaceful anarchists who peacefully built a bomb to not use it on us?
Of course anarchists are jerks, criminals, terrorists etc.
But this was a controlled operation from the git-go, IMHO. Somebody downloaded the anarkists kookbook, and the FBI took it from there. It’s a good way to discourage terrorism, but don’t mistake it for a real plan that would have come off on its own, without the FBI’s active help, support and encouragement.