This rhetoric spewed by the general public and society at large has always been upsetting for me. I see it very oftenly and more so during the specific seasons like holidays and even in September (suicide prevention month - ugh). I suppose it has something to do with the pro-life and anti-suicide society as well as a false premise that assumes that suicide is a mental illness and that it is a permanent solution to a temporary problem. (There are many more false and erroneous premises but this was just one example.) Furthermore, as we live in an anti-choice, faux-free will society (we think we have free will and freedom of choice, but only when it aligns and agrees with the society's attitude and perspective. Anything that strays from the narrative will be censored, vilified, criticized, and even other social, extrajudicial consequences will come from it), society sees suicide as a net negative, the government will not be able to obtain taxes from dead people, people will have to see the black pill of life (nihilism, life has no meaning, life is just suffering, etc.), and people are just not comfortable with that. The idea of right to die and freedom of choice just doesn't sit well with most drones (vast majority) of society. Free speech and freedom is only free when it fits the narrative, thus, we don't really have real freedom and real free speech contrary to what most masses believe in. For example, just talk about something that is unpopular and politically incorrect (or any emotionally sensitive or controversial topic) and you will be quickly called out, censored, and possibly have trouble (legal and civil consequences) coming your way.
The label of mental illness is always subjective and while psychology and psychiatry may be a science, it is a pseudoscience and more of an art form than anything. That isn't to say that all of psychology and psychiatry is useless, it has it's uses. However, the pedaling of how suicide is selfish, irrational, wrong, and that life is always a net positive is just disgusting.