Sure, having Marvel characters around may inspire people of any age to check out the comics and they will come across things like drugs, violence, etc. But Disney's tellings of fairy tales inspires people to read the original versions, and they are dark, scary and incredibly violent and bloody. People die gruesome deaths in them. I see little difference between the two. Just as Disney presents cleaner versions of the fairy tales, they will do the same for Marvel characters within their parks.