It's actually relief from the pain we all seek and not death. Trouble is at times we feel death IS the only relief from pain. However, studies have shown this is not true at all. Good pain management which includes counseling and medication as well as autogenics can be a better relief from the pain. A relief without hurting the relatives or going through what must be a harrowing experience of committing suicide.
People have the right to commit suicide and can do so anytime.
You plan a date and then, while that person is there, you might be a bit redicent to back down because perhaps that person will not come back. In a couple of cases, Kevorkian let his patients know that he had to 'do it' soon because the law or something else might stop him. That's pressure which might not be good as death is such a final step. Suicide of any type is still too difficult on the surviving relatives. Suicide involves a free will decision to leave whereas a natural death leaves the decision beyond human range.