You are assuming everyone who is trans is dysphoric. Not everyone is. Most trans are just making minor cosmetic changes, and even those who make minor surgeries are in the same camp as a person getting a boob job or getting liposuction. They are making changes because it makes em feel better.

And of course you are assuming that transitioning is in of itself harmful. Again most changes are cosmetic. A minority are medical and there's no evidence of longstanding harm. My hormones are parred with routine blood work. I am more intune with my health than probably most people.

Finally you are assuming I think gender and dysphoria are biological. I do not. The idea that it is is highly controversial in trans community. Many think gender is malleable and based on social cues