We don't know Robinson's Politics and Probably Never Will
We don't know Tyler Robinson's politics. We know (as much as we can know anything reported in national news) he was in a relationship with a trans person, or a person in the process of transitioning. But being gay or trans doesn't make you a left-winger. Caitlyn Jenner, formerly known as Olympian Bruce Jenner, is right wing trans person as was her (now deceased) Trump supporting friend Sophia Hutchins. The Republican candidate for LT Governor of Virginia is openly gay.
What if the Video was Blank?
A blank video wouldn't contradict Vance and Noem's lies