that was a good speech. I wholeheartedly agree with you. The beautiful thing about books and movies (and art in general) is that you are allowed to view them in any way you want, which means that if you got some positive messages out of it and some people realize things about themselves because of it, that's wonderful. There is no "wrong" way to look at the films and your feelings are valid. I'm one of the people that can seperate the art from the artist as well, so you are not alone in that aspect.
It has been a long time since I've seen the Harry Potter films, but I always viewed them in a positive light. Like how Hogwarts is a place where people from different walks of life can interact and learn to be equals, and despite all the challenges and doubts faced toward them, the good people triumph and create change. And really there are a bunch of themes you could spot if you analyze the movies enough. The point is, you can interpret a film regardless of what the creator says and if you still enjoy Harry Potter as a whole, that's great too.