It's twisted and bizarre that this is such a taboo in human society, almost globally (I appreciate exceptions like Dignitas [0] in Switzerland.)
Why do we endorse "My Body, My Choice" when it comes to decisions like abortion, but take that choice away when it comes to suicide?
Why is the termination of life support for terminal patients seen as a mercy, but vehemently denied when someone who is otherwise healthy rationally chooses to die?
What if someone is simply bored with life? Would you force someone to play a game they don't enjoy, or can't ever win at?
I'm afraid suicide may never be universally accepted as a human right, for primarily these two reasons:
1: It acknowledges the possibility that life is pointless, which threatens many of our entrenched belief systems.
2: Money. If people could cleanly (without pain, guilt, taboo etc.) end their life anytime they want, it could seriously disrupt the economy. When people are no longer forced to live, many industries would make less money than they do (finance, healthcare, therapy, anything that relies on cheap labor, and so on.)