One of the replies to Vulliamy's tweet rant was:
Kids must be allowed to have bodily autonomy, including gender identity and expression. This is a fundamental human right. Denying them this is child abuse.
I believe this a fairly common argument amongst TRAs. I'm surprised that they are unaware that this is the same argument used by PIE, and that by inadvertently aligning their cause with PIE they do their own cause great damage.
Children don't have full bodily autonomy for good reason.