It will certainly help Trump.
Sticking only on the topic of the riots, these things are going to help Trump.
1. Economy - The economy was doing amazing before COVID. Citizens in riot effected cities were just starting to re-open, and many now have lost everything.
Nobody can blame either the virus or riots on Trump. But they can count on him to rebuild the economy again if given the chance.
2. Riot cities - Minneapolis, Atlanta, Chicago, Brooklyn, NYC, Oakland, Detroit, Oakland, Portland, Richmond, and San Jose are all experiencing riots. All these cities also have Democratic mayors.
Hard working people are losing their businesses, their homes, and in some cases their lives. Why do these cities not use every element they can to stop these looters/rioters?
Why is no Mayor suddenly talking about the fear of a new pandemic in their respective city, as thousands swarm the streets?
3. Police - The murder of George Floyd is horrible, and must be dealt with. But these riots are generating hate and violence on all Police as a result. If not diffused, an incident like the 2016 shooting of Dallas police officers is only a matter of time. Trump has always had praise for law enforcement, I think he can help remind people, that though not always perfect, most of them risk their lives daily for our safety.