The police were told to pretty much not stop the riots that were happening. And the burning of a federal building is enough justification to bring in the feds.
Do you think the riots are going to just go away? That the Federal Government shouldn't respond to these types of acts? That Portland, Chicago, and other cities should run rampant with these criminals? You say you don't support rioting and destruction, but then you try to tell me that the feds have no reason to stop the riots because they were dialing down. Does 2 months of rioting, looting, murder, and burning across the country (with Mayors and Governors supporting these "peaceful protests" and not stopping them in their tracks) seem like a situation that will just go away? It will go away when their demands are met, their demands for the changing of the police and justice systems and the destruction of America? Sounds like a great time to live when do-nothing politicians, news, and people criticize the President for doing his job.