The only reason anyone would ever feel the need to be cured of homosexuality is because of the social stigma and the judgement that results from this. Since the only harm that homosexuality causes is offending those that insist that the social stigma is just, the more moral approach is to find a solution to the problem that doesn't encourage self-loathing and hatred for something that cannot be controlled. The fact that those against homosexuality want to encourage such self-hatred based on nothing more than their own opinion should cause them to truly reflect on how ethical their beliefs truly are and cause the rest of us to feel compelled to drag them into the 21st century kicking and screaming.
Even if the open windows of science at first make us shiver after the cozy indoor warmth of traditional humanizing myths, in the end the fresh air brings vigor, and the great spaces have a splendor of their own - Bertrand Russell