Biden doesn't have to claim anything. Any American with their eyes and ears open during this Trump/Putin administration can see that Trump incites and encourages violence and division, against immigrants, people of color, non-Christians, etc....you name it! If it's not one of his cult followers, who is white and Christian (even though he's not), then he will name call, insult, slander and promote violence. Those who claim they do not see that are being deceptive.
Trump has been campaigning on fear, he preys on gullible fools who fear African Americans, Mexicans, Muslims, gays, etc. Some white trash inbreds were weak and gullible enough to swallow his BS. Trump loves the uneducated, so easy for the fool to manipulate. Trump is adding fuel to the fire in these protests, blaming the victims, and defending the vigilantes, White Supremacists and all his white racist worshipers. Neither Trump or his followers are patriotic, that is the biggest myth of all.