I don't think a label warning would have much effect for a kid though; they're probably not going to draw much of a conclusion from that. And I don't think many kids actually buy physical media anymore (that isn't comicbooks).The main thing that irks me is that all of these movies you can still find on the shelf at a Best Buy, Target, or Wal-Mart and a kids could still buy them since they're rated "G" or "PG". No store gonna stop kid from buying a kids film. I see as them sorta pointlessly hiding something for no other reason, when a label warning would have been fine enough. It's what WB does with their cartoons. Show some fucking acknowledgement for your past. Quit hiding and denying for the sake of your fucking money tree. Pretending to look and be all innocent.
And while these characters are part of our history, and you shouldn't ignore it, it becomes a bit iffy when many of them are aimed at children. By giving them a parental lock you're hopefully giving some insurance that an adult is there to give the proper context and explain that some of these portrayals are not good. This isn't a garantee ofcourse since some parents won't really care, but I see it as the happiest medium.