From the moment the George Floyd protests turned into violent riots Trump refused the call of conservative pundits like Mike Cernovich and Ann Coulter to invoke the Insurrection Act of 1878 in Minneapolis.
They were wrong to jump the gun. Trump was being goaded into acting like a dictator which the Democrats would have pounced on him for. It was too early in the cycle.
He had to, politically, take a punch in the mouth and allow things to get out of hand. There was no good decision for him back in May.
The people were still fighting with the shock of the Coronapocalypse, stimulus checks were being mailed out and unemployment offices around the country were so overwhelmed they couldn't process the claims quickly enough to make the weekly report even close to accurate.
Trump, rightly, prioritized that while making his opposition to the looting and rioting plain for everyone to see on his Twitter feed, while allowing the local officials the leeway to deal with the problems as they saw fit.