People who oppose affirming trans kids. Why do you think you know more than doctors?

The broad medical concensus says affirming trans kids is life saving treatment. Child psychologist agree that children start to express gender as soon as they're old enough to socialize. Puberty blockers have been proven safe, effective, and reversible since the 1970's. Used to treat a variety of different disorders.

So why do you think you know more than doctors? Why is depressed and suicidal kids more acceptable to you, than happy healthy trans kids?