I would like to start this off by saying that I have no plans on killing myself and that the last time I’ve even thought of doing such a thing was nearly half a decade ago. I have autism and borderline personality disorder, but I do not think this is a reason to disregard what I say, if anything its only effect is allowing me to argue for both sides.
Against suicide:
The first and most potent (for me) is because of my religion. It is a sin to commit suicide and will send you straight to hell, so why would anyone want to commit? This also applies to many other religions. Secondly, there is always a way to solve the problems in your life. Some of these solutions may take decades of effort and resilience for some, but deciding to opt out and kill yourself is a fault on behalf of that person. Thirdly, a more popular argument, committing suicide will always leave the world worse off than it was before in some way, whether that extends to your family or even further. Even the worst of the worst people may argue that 1) they would leave the world a better place by committing or 2) morals do not exist whatsoever, even from a secular standpoint. For the former, in a utilitarian perspective, there is always going to be an amount of grief for your death, even if minuscule, + the fact that occurrences take place everywhere at all times, your suicide will eventually mean nothing. For the latter, committing suicide conflicts not only your interests (in some way), but the interests of others as well, which you will always feel a natural, instinctive moral obligation towards even if you have trained yourself not to. Fourthly, even those who have no way to make their life better because of incurable physical or mental illness have no moral justification to kill themselves other than those circumstances. Killing yourself then would not only be selfish, but even be deemed unideal in philosophies and religions that allow suicide. If someone’s path of thought contradicts this, then their death would be an inconvenience to them anyway. If the aforementioned immoral solipsistic point of view applies, suicide would only be a temporary solution to a permanent problem.
For Suicide:
The first argument, albeit weak, is that if you legitimately believe that you are the only conscious thing and that killing yourself would deactivate your pain eternally, then suicide is permissible. Secondly, from a eugenicist perspective, someone with incurable lifelong illness committing suicide would be a good thing on behalf of humanity, even if there is grief that comes with it. Thirdly, from a secular standpoint, people that have no way to stop their own death or pain (such as people on death row or those with dementia), then killing yourself is a better option. Fourthly, from
an idealist perspective, suicide is nothing more than freedom of choice to do what you will with your body. Fifthly, if you have done something that is “worse than death” (at least in your eyes), then it makes sense to commit suicide. Sixth, from a theistic satanist perspective, suicide is a good thing.
Feel free to refute, add onto, or ask for more explanation about any argument here