I think you are absolutely right that everybody knows they will not be less violent if Trump is re-elected.
But I’m not so sure his hardcore base care. I don’t think they want less violence. I think they want leftwing and Black people punished for violence. Punished severely.
That’s what law and order means for them: using law enforcement to keep them on their pedestal of power.
Where I live in rural Michigan which is strong Trump country, you don’t hear Trump supporters wishing there were fewer protests. you hear Trump supporters wishing cops were beating up more of the protesters and putting more of them in prison.