To address the OP's ..OP: I'm not sure where you live, but in the US (except mebbe deep Alabama, heh) there's been a gradually increasing wave of acceptance for 'alternate' lifestyle choices since the 1920s - the most obvious example would be widespread acknowledgement of gay/lesbian/bi/etc sexuality. Most of the opposition to extreme or alternate lifestyle choices either comes from a short-sighted traditionalist view, or recognition of the fact that Choice A is not a viable or sustainable lifestyle for humankind. Pick a non-heterosexual orientation and pretend that everyone in the world adhered to that orientation: there goes the concept of traditional reproduction (in b4 IVF). Not hijacking here, just clarifying. The same goes for a stereotypical 'nerd' who doesn't have good communication skills - this group may be ostracized because people instinctively realize that communication and adaptation are fundamental parts of being a successful human.
On suicide:
I support one taking control of their last decision, assuming they're either in such a psychologically & physically irreversible frame of mind that it's their only perceived option for relief (i.e. suicide as a positive goal), or someone who's lived decades, experienced different environments, cultures, etc; and has decided that off is better, or that they're simply done: an 'honorable' suicide, by choice.
More likely, it's someone with one or more mental illnesses who will refuse or avoid treatment and help, and are thusly drawn towards one black and white choice. I've known several people who were in that position; one was/is? committed, the others killed themselves. In all those cases, each one earnestly believed nobody cared about them, despite strong and persistent evidence to the contrary; they refused treatment, or lied about getting help.
Basically they had convinced themselves into a black hole that they were psychologically incapable of getting out of. When you're in that situation you're thinking from a wildly skewed perspective, so when someone tells you to 'snap out of it' or that 'things will get better', it literally will not compute.
For clarity, I'm not talking about common depression or someone ragging on another's musical taste, socioeconomic status, choice of friends, etc; I'm talking about serious and deep-rooted issues that some people carry throughout their lives.
Suicide at a young age, however, is asinine and short-sighted. Life inevitably gets better, all you have to do is push through it.
There's also a slight question of eugenics towards unproductive groups who may be drawn to suicidal thoughts - those who don't strive to improve self, environment, or society, whether from inertia or mental illness. But that's not really in the scope of this thread.
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I went through the cutting and related crap, and though my grievances were 100% real and devastating at the time, I can't believe what an idiot I was - both to think that, at the time, it was the WORST PAIN EVAR to be experienced in life, and that I gave myself lifelong scars over issues so trivial. Things hurt a lot more significantly as you age, you just develop better coping skills.
ETA: oh yeah, the 'suicide is selfish' argument is utter BS. Living for someone else is a revolting concept.