He probably, in some sense, made a mistake. Perhaps a patient would've decided differently? Doctors do make mistakes, and some of them are fatal.
I think you should be allowed to die, as long as you're mentally sound. Kavorkian wasn't helping suicidal folks with depression; he was helping those with terminal illnesses. There are many methods to commit suicide (and they're on the internet, with details), but if I were dying of a terminal illness, I'd rather have a doctor help me than do it myself.