The chance that he or any of his triggered loser comrades will follow through on that threat is zero. He’s just blowing smoke. But it’d be amusing to see them try. And quite instructive for progs in general.
That poster ("ripitthrowawy") is quite likely a Federal informant who has been let out on a very long leash. It's a crappy part-time job that basically pays nothing, but it does come with certain privileges. Like the authorities will ignore misdemeanor crimes and even some felonies. Just keep the provocation reports coming in.
And when hot-header posters respond, the Feds can add a few more names to the lists that are already too long for them to work on. It shows the bosses that they are "doing something".
The possibility that a "Non-Governmental-Organization" will train and equip "technicals" to furnish "protective escort" to a rent-a-mob of "mostly peaceful protestors" who show up in a small town or in a suburban area is not zero.
A couple of FBI trainees and a supervisor could roll up such an attempted terrorist operation in a month and have all of the instigators under indictment. If they were allowed to work on such things, of course. Too bad they get other instructions.