Suicide is a violent act on the self and even most of those people who do not want to live are afraid to do it, not only because they fear it won't work, but also because of the people they'll leave behind to clean up their "mess." If you really want to commit suicide and you are fully committed to it, after you do the act, there will be no one on Earth to judge you for it. I don't believe there's judgment anywhere in the universe. The only judge is yourself, in life and in death.
Suicide is a personal choice, but a very disempowering and selfish one. Sure, you could argue that a dead human who doesn't want to live is better than that human living to use up more resources, but that's kind of grim. If we all raised our consciousness, we could figure out a way to meed everyone's needs and have plenty to spare. It's just too few people are doing it today. Killing yourself is the easy way out. I guess that's why it is so negatively conditioned.
If someone is dying or in debilitating pain all the time, then they have the option to end their life. But ending your life is very hurtful to those you leave behind on Earth.