Change the tune?
Why? Because you think it's okay for the POTUS to suggest a little bit of violence against someone who has been arrested (innocent until PROVEN guilty in a Court of Law) is perfectly acceptable?
There are indeed lots of incidents of police brutality carried out across many different presidential terms, but the only other presidents I can think of who actually suggested violence and police brutality were LBJ and Richard M Nixon. That was a totally different era, and one in which should be resigned to the history books for many reasons.
Unfortunately, Trump doesn't do history, and his rhetoric has been cited as a contributory factor in the causes of Pittsburgh, Charlottesville, Christchurch and other right wing terror/racist/anti-sematic incidents. The video of him addressing those police officers, and telling them to treat prisoners with contempt flies in the face of what it is to be a law abiding, law upholding human being.