Right. And there's never been a moment in history when they weren't trying to do that. I'd argue it's because we're freer in some ways nowadays that...
Maybe the Avengers got him from the Wakandans, but couldn't find a way to bring him back, so SWORD came in and pretended to be all nice and took him...
Vision was a person, though. I don't think the Wakandans would mess with that. Plus, it didn't seem like T'Challa had any interest in retrieving the...