Hmmm, lets review shall we....
It is already illegal to harm another person, police or otherwise,
It is already illegal to seal, loot or burn buildings,
Trump does NOT run the police departments around the country,
Trump is not the mayor of every city in the country,
Trump is not the governor of every state,
Trump has offered federal support to every governor, mayor and police department in the country and they have, for the most part refused.
So please enlighten me, how is Trump responsible for any of this again?