Gay conversion therapy is a moronic idea.
Doesn't mean we have to go ban it. Not sure why people seem to think that just because they disagree with something means that they have to go ahead and legislate their ideas to the rest of the state/country.
Stop banning things.
I guess that turns on what kind of psychological damage is done by this sort of kookery. We have lots of laws that are designed to avoid self-labeled "professionals" from harming folks. If it is just a waste of time, and a big joke, then perhaps that sort of thing should just be put on ignore. But on this one, the burden of proof should be on those practicing the kookery - since there is no offsetting efficacy whatsoever.
There's no way to show efficacy if a practice is banned. The thing about these types of laws, they don't just ban methods of therapy, some of which are abusive. They ban aims of therapy - which comes awfully close to the government inserting itself in between the therapist-patient relationship. If the standard is the government is going to ban anything that hasn't been proven to be effective, then the practice of clinical psychology is going to be severely limited.
Let's legalize bloodletting, then.