Bad Comic Book Movie Writers

Thanks to the idiot that did the Tim Burton Batman movie in 1989, I know someone who now thinks that the Joker killed Batman's parents. And there's no convincing this person that it wasn't the Joker (refer to the actual comic books - I've read from several sources that no where in the comic book lexicon has it ever been suggested that the Joker killed mommy and daddy wayne). Movie writers should stick to the comic book stories and not go around changing things. Next thing you know, Wonder Woman won't be an amazon, she'll be a geisha. These writers need to be aware that people who go see movies don't necessarily read the comic books. If the writers screw up the history, then they create chaos.