trumps unconstitutional attacks on peaceful protesters are for these reasons I think,

1. Direct attention away from the virus, its killing his poll numbers, he knows its hurting him.
2. Reinforce his claim he's for law and order claiming these peaceful protesters are criminals
3. To control the news cycle, especially now and over a weekend
4. To use and claim Biden is against law and order, and try to pit the police and Biden against against each other with. He did this against Hillary too.
5. And to intimidate others from protesting with use of extreme violence by his secret unmarked police.
6. And to use against any judges who dare to rule against him, with more threats and accusations, and firings.
7. And to manipulate the media for his own political benefit . He has people leaking stories to the media do this with.
Even if the court claims its unconstitutional it served its purpose for him
Notice how little the media is talking about trump allowing putin to put bounties on and kill our service members is now, and how he got that off the front page news? He's doing this because it worked.