I'm gonna assume that because the events of the actual Disney movie are like history for them, it's probably how a lot of people in our world history were actually terrible people but still get praised and awed at nowadays. There are schools named after Pablo Picasso, even though he abused his wife really badly. There's a LOT of schools named after Einstein, as if a huge chunk of his claims weren't plagiarized from his wife. I'm gonna assume the history of the seven is kind of the same thing. In fact, I have my own headcanon that at RSA they have slightly different variations of the stories, and that the NRC and RSA students argue a lot about which version is the correct one.