You're referencing the US Constitution. I'm not all too sure how it works in other nations but the purpose is the same. Governments were formed initially with the intent to uphold the basic unalienable rights of citizens during the time in which they were alive and lived in a country's boundaries. Blah blah blah.
There is no document that says "Oh you can't kill yourself, Uncle Sam needs you to join the military" or whatever. (And no there isn't some document out there that says "go on kill yourself, lessen the taxes for everyone else,")
So long as the action of killing yourself does not impede on the rights granted another citizen, technically there should be no reason why the law would stop you.
And suicide could be a right I suppose but regardless of whether it is or not, it's a choice an individual makes. Me personally, I don't particularly care one way or another about laws. As long as I'm not endagering anyone else there's no reason why I can't or won't go about my business and do whatever I please. This includes suicide.
There's something called the Death with Dignity Act. I know it's recognized in oregon not sure about everyone else, but basically those that are terminally ill can legally kill themselves and seek assistance if necessary.
I don't think the act should exist but hey that's one more right I have :rolleyes1::D: (If I move to Oregon):(: