People who say that people who commit suicide are pretty much ignorant.
It's already been said, but people who kill theirselves have lost pretty much all hope in life. Imagine going through your whole life without any friends, being bullied all of your life, having more than one person very close to you die, or even watching someone die. It's very distressing.
Some people don't have family who really love them.
And imagine if you're being bullied. You'd tell the teachers, but in a lot of cases this makes it worse. You could try fighting back, but that would make YOU seem like the bully if people are ignorant enough, and it may not end the bullying, it could only intensify it.
And look at the state of the world now. There's getting less and less reason to live for. People are constantly fighting now and don't seem to be as nice as they were a few years ago, at least online from my experiences. Stuff like music and some video games, the quality of them seem to be gradually getting worse and worse now as time goes on, with the odd diamond among all of the crap.
There's also been major technological advances, and people may feel like they're being forced to use them rather than use older technology which they prefer, and some people will not want that, at all.
Some people also don't see themselves having a future at all. The economy at the moment is terrible, and it doesn't seem to be improving any time soon. Less jobs means that people don't know if they'll be able to ever get a job or have a successful life. A lot of people have no self esteem, and think that they won't be able to do anything.