It's just SOP, right wing, left wing, Muslim, doesn't matter to them. They want to make arrests, even if they have to incite the illegal acts themselves.
Remember it was the FBI's inside man who prepared the World Trade Center bombs for the first attack.
If anyone in a group is advocating killing cops or just making random attacks, it's probably the FBI mole.
BATFE will do that too. It's why they entrapped Randy Weaver, they wanted him to infilitrate "white power" groups in the area of his Ruby Ridge home.
Agent Provocateurs .... Even people on this site that make threats may just want the isp addresses of those in agreement in order to better observe those that might be a "threat" to the government.