I vaguely object to calling it deathist.

The SYBIL system deciding things such as what career people would be best suited for seems to damage some people so much that they become catatonic, for no apparent reason except to make sure we know it's bad

I don't recall something like this happening. Most of the time -- as far as I remember -- it's other people reacting to psycho-pass information that causes psychological damage. E.g., one character is extensively bullied because of their psycho-pass, one or two characters' psycho-pass degrades the more they obsesses over it, etc.

One minor villain is a standard "wanting to be immortal makes you evil" type of character

I'd say he was more "evil and coincidentally also wanting to be immortal." The only character that really disagrees with living forever is Kougami, whose expected future quality of life is relatively low.