Until a mental health issue has been concretely determined, I believe it's somewhat irresponsible to toss the idea around that it's the underlying root cause for this obscene behavior.
Religion, like other dogmas, has historically empowered and continues to empower a lot of otherwise mentally healthy people to feel okay doing plenty of fucked up shit, simply because religion said it's okay to do it.
Ever heard of the Stanford Prisoner Experiment? Many "normal" people will do terrible things if simply given permission.
for real, I'm pro trans rights and I still sometimes accidentally deadname Elliot Page because I have dyscalculia. if you ban me for that aren't you being ableist?
also yes context is very important.
if I say "when Caitlyn went by the name [X], and she used [Y] pronoun, [Z] thing happened to [Y]", I assume I will still get banned for deadnaming even though I'm innocently adding clarity to a conversation.
to make things worse, if someone is trans and gender fluid, and I call them by a name or pronoun they used last time I knew about them, now I've committed a crime of which I had no knowledge.
this blanket condemnation of deadnaming is just dumb. it requires nuance.