Batman: Could it be that the white supremacists are destroying things to make the protestors look bad?
Good point. I have seen something to that effect. Demonstration starts out peaceful, then white extremists move in and start looting and setting fires in a calculated move to create as much disruption as possible in order to undermine the protest and the protesters. I don't know if this is true, I have just seen it mentioned in passing on one of the news media. It wouldn't surprise me if it was true. It is very much the kind of tactic to be expected from today's right-wingers.
Yep. I understand that for this reason black protesters in Minneapolis are deeply suspicious of white "supporters".
Declaring "antifa" a terrorist organisation is of course a desirable goal, makes summary execution and brutality as well as "detention" without charges or representation legal. (But AFAIK Trump cannot declare a domestic organisation "terrorist" - his friends in the KKK enjoy constitutional protection)
He was threatening to do this with "MS13". The video below is Trump in action a few years ago (2017) - advising officers to "please don't be too nice". Possibly more appalling than Trump's endorsement of the use of violence as extrajudicial punishment is the cheers from enforcement officers. Of course if you criticise this blatantly fascist action, then you're "some kind of radical left-wing extremist - supporter of drug cartels etc". It's a sick country - led by a sick monster: