I agree that some kids are impressionable, especially today when it's such a "big thing" to be trans. If we all knew about trans from early age... if it wasn't a big deal... if we were all accepted equally, maybe it would be different. I think that teens who suddenly think they might be trans should find a good gender therapist to explore ALL the avenues... in fact we all should.
But I WAS that boy. I was a boy that was put in an all-girls class. And it was like a dementors kiss, robbing my soul of hope. Because of that I got C-PTSD, alexithymia, derealization, etc. If I had known about trans people and been able to say I was a boy, and allowed to socially transition, that wouldn't have happened.
To say they shouldn't allow kids like me to know about trans people, and allow them to socially transition at 5, is to say I deserve C-PTDS.