I agree with the theme of your critique, but you're glazing over a lot of stuff here. You've got attempted genocide in Hunchback, Bambi's mom is killed in front of him and the same thing goes for Simba's dad, and in Atlantis an entire culture is nearly wiped out to deliver a super bomb to the kaiser during WWI. I feel some of the anti-nazi propoganda is pretty gritty as well.
I really wish there were more films like this. Disney always advertises that their films are fun for the whole family but I think that this is the kind of story that needs to be told more often. Things don't need to be dumbed down for kids. Sometimes you need to trust your young audience to deal with something sad or frightening instead of giving them sugar-coated stuff only.