There isn't ever going to be any truly ethical consumption under capitalism, it's a system that emphasizes making the biggest profit so any company whether it's corporate or core is always going to look to cut the costs of labor.
I don't think there are any shoe brands in skating that are even trying to be more ethical when it comes to ensuring the factories they use are paying and treating workers adequately, possibly Last Resort?
Anyways, most shoe companies are fucked and I don't really like backing them so I definitely try to last my shoes as long as I possibly can, that is probably the best way to be an "ethical consumer" when it comes to skate shoes.