All of us wish for an easy and quick and painless death and the wish grows stronger as we grow older. Much of the terror that diseases like cancer and AIDS inspire is caused not by the fact that we die in the end. After all, all of us must die one day. The terror is caused by the manner of our passing if we contract these dreaded diseases. Our death will be slow, painful and terror stricken.
For more see this page on Preparing for Death