Conversion therapy has been proven time and again not only to be ineffective, but to have an approximate 40% suicide rate in patients. That alone makes this practice extremely unethical. Homosexuality has not been considered a mental disorder since the 70s, and to insist that it is a disorder to be treated instead of the natural variation it is, is a cruel practice. To normalize conversation therapy and insist it is somehow an actual treatment for anything is setting people up to have unreasonable expectations, and reinforce the idea that LGBT folks are sick. Societally that is dangerous.