I'm trying to figure out how your viewpoint isn't the same as saying "better that they kill themselves than maim themselves!"
Yeah, it's hard to understand an actual argument when you're strawmanning them.
You can keep shouting "but they're maiming themselves" if you like, but even assuming that gender reassignment surgery is "maiming," which is an argument so stupid I don't really feel the need to deal with it--you should go take up your body purity crusade with a plastic surgeon--it's presumably better than death.
Since you apparently didn't read it last time,
maim
[meym]
verb (used with object)
1.
to deprive of the use of some part of the body by wounding or the like; cripple:
The explosion maimed him for life.
2.
to impair; make essentially defective:
The essay was maimed by deletion of important paragraphs.
noun, Obsolete.
3.
a physical injury, especially a loss of a limb.
4.
an injury or defect; blemish; lack.
It is not a debatable point that "gender reassignment" is maiming. It is the literal definition of the word. If you want to argue that, in some cases, maiming is not a negative thing, fine, go ahead and make that argument, but to claim that "gender reassigment" is not a maiming action is objectively false.
As for your claim that plastic surgery is tantamount to "gender reassignment", then for the record, yes, I have problems with plastic surgery that entail the destruction of bodily functions. However, I have no issues with procedures like liposuction or wrinkle removals, as those do not inhibit actual biological processes. (I suppose you could make the argument that they do, and thus would be maiming, but anyone with realistic understandings would disagree with you. That said, I will never partake in any of these surgeries, as, even if they are not destructive, they are cheating, and cheating is for bitches bastards cheaters.[Can't be sexist!])