Are you referring to ritual suicide as a way to erase some shame that he has brought to his family, or suicide just because he's a sad little samurai? I'm not big on Japanese history, but it doesn't seem like a warrior culture would have been real forgiving of killing oneself because one just can't take it anymore.
In the ancient Samurai tradition it was an act of regaining one's honor after losing it by committing a crime, doing something that embarrassed your Diayamo or Lord, losing a battle that you were commanding, preventing your enemy from counting your death as his (though ironically your enemy may be the one who takes your head before you cry out in pain or topple over from shock and haven't completed the full rite of seppeku. Which by itself is a tremendous act of bravery. It's not just slitting open your belly, but removing the blade and re-inserting it to cut upwards, the fact that you've shown the strength to withstand that much pain WITHOUT crying out or fainting from shock is a very brave thing. Also to do it within a specified time frame ... so many beats agreed between you and your second (the guy who takes your head)... so there's no dawdling about giving you time to make up your mind. So in their eyes it's a way to regain honor because it's not a very easy thing to do.
Side note; noble women (who were sometimes also Samurai) were allowed the ritual of seppeku but it was taking a smaller, more slender blade and thrusting it into their throats rather their bellies. Their heads were still taken. Everyday citizens were also granted the right to commit seppeku but they were not done in the same manner as the Samurai. They simply kneeled before the samurai (usually the one they offended or a chosen one) and allowed without fuss the removal of their heads.
What's mind-boggling I think is the fact they did it willingly and at times gladly.
Moral reasons, hmm, let's see. If one has people to whom one is responsible, like a family, it's wrong to leave them to fend for themselves. If one has left debts, it is unethical not to pay them. Then there's the emotional pain left in one's wake but it's up to the individual to decide if they care about other people's pain, I suppose. As a parent, I think the worst pain in the world would be to raise a child, love him, sacrifice for him, and then watch him unconditionally reject life.
Patented suicide is a selfish act. I've lost several friends to it myself and it's a terrible thing. Absolutely leaving the ones behind to fill in the void now left unexpectedly.
It IS a terrible thing for a parent to have lost a child this way. Terrible that the child felt that their problem wouldn't been heard or understood by the person that should matter to them the most... their parent. But again it is an act of selfishness.
I think if someone really wants to do it nothing will stop him, and the idea of making it illegal is amusing. What're they going to do - arrest the corpse? But I don't believe it should be ok to assist someone in it. It's way too easy to pull the plug on someone else, and if one wants to die he should have the stones to do it himself.
That is very true, that no-one can really stop a determined suicide. And it is a oxymoron to make it illegal but it's illegal because sometimes there's an attempt and it failed or was interrupted. Thus for their protection they're arrested and placed in a "safe" holding cell or room so that help can be given.
As far as assisted suicide, I think that it should be allowed. Some are just too far gone and in terrible pain that no amount of drugs can diminish and they just physically cannot remove themselves as they would like. They got the "stones" just not the capacity to do so. What do you do for them?
But that is in an extreme case where nothing else can be done for the person.
I think that a terminal cancer patient (or other life taking illness) who has say; six weeks to six months to live should NOT commit suicide because that is time enough to do something for your fellow man or for your family.
Jack Nicholson and Morgan Freeman are in a movie called The Bucket List
http://www.imdb.com/title/tt0825232/ in it they selfishly do all the things that they've always wanted to do... living life to the fullest.
Kacey is right, our views on suicide stems largely from religious beliefs and backgrounds. So hence it's illegal to try... here in the U.S. anyway.
QUI-GON get those thoughts outta your head eh? We still need your invaluable input here on MT

So no need to re-think it. Stick around for a while longer. We still love ya!