I can understand what you are saying however I STRONGLY disagree on your conclusion. If those things bother you and don't express the values you want your options should be either to A) watch them and then have a discussion with your children to explain what wasn't acceptable or B) find new movies that display the values you want to pass on.
Changing the past to reflect the present or ideal future is a TERRIBLE idea. I don't know exactly when it was that we all decided that we can't ever tell new stories or create new things instead of rehashing creative works of the past but I'll be glad when that trend ends.
These situations are perfect for having actual, meaningful conversations with your kids. Not only will you clearly articulate expectations to your kids, but you'll grow closer.