Racial tension always helps the GOP, almost no matter the context. That shouldn't be controversial.
Is there anything that doesn't help Trump according to you?
Well this could be a cross cutting issue. Unlike 2016, Trump is the incumbent. Isn't civil unrest one of the Lichtman keys? So even if the racial angle helps him, if there is civil unrest under his term it isn't good for him.
Good leaders do not egg people on. They seek to stifle violence -- not promote or rationalize it. Polite protests are not unrest. They happen all the time.