I knew I was going to get these sort of replies. You just jumped because I said mentally ill like you think mental illness is some deranged psychopathy or something. Depression is a form of mental illness, too. Mental illness doesn't mean someone is 'insane', it just means that the behavioral patterns, thoughts and moods are broken. This can manifest in entirely different ways.
Someone thinking he is born in the wrong body is definitely not a sign of mental healthiness, imo
The fact that the majority of them have considered killing or have killed, or at the very least tried to kill themselves. You can look that up pretty fast. This is not a sign of a mentally fit individual. Again that doesn't mean that they should be punished or anything of the like, but they should be treated and helped, not encouraged. That is why I gave the ridiculous example of the superhero stuff. At the end of the day, if someone has a bad habit, you don't encourage him, you try to cut it out. If someone does fentanyl or meth, you don't say 'hey man, more power to you, that's healthy', instead you try to help him, if you can. Find out what's the crux of issue since there is always something deep down that has affected them to do that.