Is it fair to say RHPS is both a celebration and a warning against Liberation?
I was having the classic "is Rocky Horror transphobic" debate with one of my friends, and it lead to us discussing the ending. They argued that the film is a cautionary tale because it leaves Brad and Janet emotionally scarred from being liberated by Frank-N-Furter. I always thought the line "darkness has conquered Brad and Janet" was supposed to say that they are traumatized after watching Frank, Columbia, and Rocky being killed right in front of them, and that they won't be able to go back to their old selves now that they have tasted "forbidden fruit". I essentially see Frank-N-Furter as being a tragic figure who is essentially a glam rock Frankenstein. He simply wanted to be accepted, but it drove him too far to the point of harming others which is why he is killed.
I personally think that the story is both a celebration and a warning, but how would I explain it to them?