From my own experience, I would agree with Parthon, I found that after I spent years of going through the ache of suicide when I was looking back, suicide probably wouldn't have been a good idea. I wouldn't have made the huge impact that I have made in people's lives or others lives making an impact on mine as I have discovered. It is really tough going through suicide but I think that the exception would be if the person really will die and that will just speed up the process. Such as if there is a dying person that is supposed to die, but because of life support machines and the grief of his/her family, he/she cannot die.
Taking that person off life support would be considered a suicide of sorts and I believe in that case, it would be a good idea to have suicide as an acceptable way to die. Suicide isn't always a healthy person killing his or her self, it could be a dying person who's family or those close to him/her is just keeping him/her alive because of their ideals of clinging to life even after the fact.