Isn't that a bit of a straw man? I mean we're talking about passports, not access to domestic violence shelters or prisons - to my knowledge there would nothing to gain from having a d instead of an f or an m on your passport. Not reason, therefore to do so unless you felt you need to surely?
I don't accept your implied arguement that trans people are inherently 'dangerous' however I do accept that there are certain circumstances like those you mention where the issue of self determination is tricky. I have no issue with self determination. Call yourself what ever you like. That doesn't stop you from having to prove a sincere desire to transition before accessing certain services such as woman's aid shelters perhaps. Indeed it seems only reasonable to protect all woman using such services, including trans woman, from the threat of men pretending to be a woman to gain access to them. A trickier point may be what to do with people while they're meeting those proofs, and deciding what proof is reasonable.
What governs access to a domestic violence shelter or access ultimately to almost any important or official service or venue?
Identification - I. E a passport
Therefore the details that passport contains are very important.
I think you have perhaps read too much into my argument if you think I'm suggesting my argument is based on trans people necessarily being (physically) dangerous (although I don't doubt in certain cases this could be true)
A a cis male I personally have nothing to fear (physically) from any trans person.
I do however, for example, want my daughters to be able to train and compete in competitive women's sports against other biological women and not against biological men if they choose to do so as biological men, on average, have a huge advantage over biological women when it comes to strength and physical endurance and hormone therapy and genital surgery doesn't undo past male physical development.
I am primarily however against the idea as I view it as part or a wider assault on one of the bedrocks of Western enlightenment society. Its an assault on objective reality which is to be replaced by subjective feelings.
It may seen silly or trivial to you but I believe its none the less important. As I consider myself a Liberal I support the general right of people to express themselves how they see fit but I won't sacrifice my cognitive functions to state what I know not to be true.......
Which in this case is that a trans woman or man is to be considered in exactly the same fashion as a cis woman or man.
This is evidently not true for me or the vast majority of the populace.