But it does matter. Maybe not to you directly, but the January 6th treason attack was a direct result of his influence. Obviously people who follow him are massive bell ends, but they still matter and they still vote. America's democracy is far from perfect, and has definitely struggled to cope over the past few years, but it put him in the most powerful position in the world for four years and despite all the evidence, enough people are still supporting him that a second term still can't be ruled out.
It beggars belief, it really does, but you really should care about it and a single person being a martyr has historically changed the world.