I'm not saying I don't support Vans or any other brand, I'm just saying that when it comes to shoes, it's really hard to win on the skate-politics front. I can't think of a skate shoe that's made in the US, nearly all of them are sub companies under either a mega company or corporate shareholders, and many (if not most) support skaters that I like, be it Nike or Vans or whoever. Unlike hardgoods, I think choosing shoes because of political issues is an effort in futility.
Beyond that, I'd argue that skateboarders adopted Nike loooong before Nike tried to adopt skateboarding.