I think we're just going to have to agree to disagree. I personally think it's simpler to continue to refer to "Chelsea Manning" as "Bradley Manning" with he/him, even if they decided later to completely change their identity. Close friends can call them "Chelsea" out of respect, but society should not rewrite history to erase all traces of "Bradley" in order to accommodate one individual's mental health struggles. I find (the history rewriting) to be extremely confusing and, frankly, Orwellian. That said, if I'm interacting with a trans person that prefers some name/pronouns, I will use them out of respect, even if I fundamentally disagree with a lot of trans activism.