Because its the FBI who are pushing them to do illegal things so the FBI can swoop in and arrest the bad guys and be the hero.
Think of how many criminals the FBI have put away for very bad things.
Now think of the possibilities of holding the threat of substantial prison time over a criminals head to persuade him to incite other radicals to do criminal things so the FBI can have “hands off” influence into the crimes being committed and the resultant arrests and honor and promotions that will follow.
The FBI tried a silent Coup d’état on Trump. Do you think blackmailing a small time criminal is above their conscience?
The man setting in the pickup truck driven by Cliven Bundy the night LaVoy Finicum was ambushed and murdered, was an FBI informant.