It's because financially, it's better for the community if you work and contribute, pay your taxes, etc.

I personally think suicide is so hard on the people left behind because it comes as a shock. No one talks about it ahead of time, and everyone always thinks they could have done something to stop it, so they're guilty. If the stigma was taken away, and people knew the real reasons behind it so they didn't take the blame, I think it would be a whole different ballgame.

Also, there are societies that don't stigmatize suicides. It's not across the board.