There are many people who live in pain every day, whether it is from old age or a life-threatening illness. Assisted suicide and self euthanasia should be a choice that every human should be allowed to make. They can give the death penalty to convicts, so I believe to be able to make the choice to end your own life with or without help should be there for anyone to have.
People should be allowed to do what they want with their own lives. As long as they are acting on their own desire and can make that decision with their right mind, then no one should have the right to interfere. Some people live in daily grief or pain. Why not let them end the suffering?