I don't know, I don't like to assume these things.

Either way, some ideas are "heretical" for a reason: they lead to worse outcomes. You could argue under the same "trans are mentally ill" model that gay people are too. But we don't, because letting gay people live their lives (or more accurately, not oppressing them) leads to better outcomes. That's what it's all about. And it's the same with trans people - if they're accepted and allowed to present how they want, outcomes are better.