It is different because it ends a life, and for that reason it is irrevocable.
She is right that, for some, the stain of humiliation can indeed be irrevocable.
She filed for divorce in August 2009 because of an “irrevocable breakdown.”
also irrevokable, late 14c., from Latin irrevocabilis "that cannot be recalled, unalterable," from assimilated form of in- "not, opposite of" (see in- (1)) + revocabilis (see revoke). Related: Irrevocably.