I'd be okay with the ex-gay programs if they weren't proven to cause psychological harm. It's not just useless, but actively dangerous.
I have the same views on other quackery as well. I think it's okay for a person to choose crystal healing or some other bullshit like that if they want to, because by itself it doesn't cause harm. If they were feeding themselves arsenic every day, well, that would cause harm and that is the reason why Laetrile is illegal in the USA.