In the end, it all boils down to the practices you subscribe to. In Christianity, suicide is considered to be murder without asking for forgiveness, because technically you have murdered yourself. In Afghanistan and Iraq, if you committed suicide via bomb and killed the enemy, you were rewarded. In ancient times, it was better for samurai to take their own life over the possibility of dishonor falling upon them, since honor was the most important thing. It all depends upon the individual's view and how what they put their faith in. As for atheists... I don't know, they probably consider it to be the cowards way out.