There are trans who think that the sooner a child identifies with a pronoun, the better, some even saying that all children should be on puberty blockers until a decision is made.

If you operate under the assumption that any slight deviation from extreme gender conformity means a child is trans then that thought process makes sense. This is why i don't think that they are honest actors. They often point out that there isn't one way to be a man or woman. The main problem that they have as adults is having an aesthetically poor transition outcome because they went through puberty. They think "if only i hadn't gone through puberty I would look like a real man/woman"

Therefore it's easier for them to create a narrative that all children are trans than to deal with the reprecussions of transitioning. I'm not sure they actually believe that but in their absolute narcissism they are willing to sacrifice all children for the validation of their own identity.