The producers created the trailer to promote the film. If the trailer looks like it's promoting ethically perverse material, I have every right to cast my judgment at that point and say this film is not for me.
I'm not going to sit through a film that seemingly promotes itself as the sexualization of young girls because someone told me that it has a good message at the end. And that's fine. And it's fine for people to cancel a subscription because of that presumption. I'd rather be safe than sorry when it comes to stuff like this.