Antifa rioted under Trump because Trump was the leader of their enemy (a free America).
Just because they haven't heretofore made a lot of noise under Biden doesn't mean that have disbanded or have taken a vacation.
Their actions are always intended to further the cause of Marxism. That includes much more than rioting.
When rioting furthers their cause, they riot. They obviously have concluded that these riots will not damage their cause and will indeed further it.
ya okay man... youre the all knowing appearently. But if I placed a bet on it, it would all go on my “assumption” of stirring up the pot for the 2024 elections and no other.