I don't know if you're intentionally misrepresenting the situation or legitimately don't know. There was a time when the scientific community believed what you are suggesting. That trans people had an illness that caused confusion about their gender, which led to depression, and suicidal thoughts. But in the last decade the science has indicated something different. Yes, Gender Dysphoria is a real thing, it's possible for your brain to tell you one thing while your body tells you another, and no amount of societal acceptance will solve that; the only real known treatment is to transition the person's body to match what their brain expects.

But the depression and suicide that often happens post transition is always associated with how society reacts to their transition. After years of study on this topic, we now know the depression/suicide has nothing to do with their transition. It's brought on by the people around them who see them now that their body physically reflects the self they've always known, and reject it.