Because Republicans have no other course of action other than to become more authoritarian and anit democracy as time goes on. It’s mathematically impossible for them to ever win the popular vote and the electoral college is slipping as a possibility as well. So that only leaves political violence and actual violence as an option. It’s not Biden’s fault outside of not being left leaning enough. Conservatism is a death cult, meeting them half way in anything is a fools errand.