Ugh, morality strikes again.
Listen, other people's opinions can be entertaining. Some people can make genuinely valid points for their argument, and maybe make you change your mind about a subject. For the most part, though, answers to moral questions are going to fall into two categories: smacktards and lenience.
Anyone who answers 'nobody should kill themselves, it is against God/my religion' is religious, and I have a massive distaste for religion and those who adhere to it. I won't argue against it here, since I've gone blue in the face doing so before and been given no better answer than 'you'll understand when you're older', but suffice it to say that anything based purely on a religious belief is as important to me as whether you squeeze the tube from the middle or the end.
Most people who answer 'it's their choice, even if I don't like it' have a somewhat more sensible point of view, though in my mind still not entirely accurate. Certainly I am important to myself, and someone else whom I have grown an emotional attachment to committing suicide is going to hurt me a fair bit. I should know, my mom did so not very long ago. But the thing is, there is no objective 'right' or 'wrong' choice in suicide. Killing yourself might be entirely necessary in someone's mind, say for some insane cult, or because a crazy person has promised to kill someone you care about more than yourself if you don't. The rest of the time, it's to escape pain, and one would hope that others can help you in most situations. Alright, there's euthanasia and vegetables and terminal patients in there, but that's just a few of many different situations.
What I'm saying is, it depends on the exact situation, as it always does. Emotions are strong things, and we may want to escape them, and suicide may be the fastest way to do that. Some people might not be missed as much as others. Whatever you do, it's ultimately up to not just you, but the people around you; there are ways to stop someone, even temporarily, and there are ways people can help in a lot of situations, if you let them know you need it.
Alright, enough soap-boxing out of me. Time for the shorter, less tl;dr responses.