Death has been one of most muddled metaphysical issue in philosophy -- an inevitable event that awaits the mortal man. Since we cannot empirically endure death, some would say that it is just a matter of speculation; somewhat supersedes human understanding.
But if the state of nonexistence is unknowable, where did we get the idea that we should avoid death? Plato contemplated that we aren't certain on what awaits us in the realm of death, what if in death, there exists the greatest paradise that will ever be?
For the Epicureans, death is unproblematic. While living, death is just an unexplored concept, and death takes away everything as soon as it is upon us, we will not suffer anymore.
It appears that humans are programmed to fear the unknown; and we aren't certain whether death is good or evil. It could be justifiable for a suffering man, and evil for it will incur pain to those you've left behind.
The latter poses more questions; is it enough to eliminate potential sufferings that surrounds a person's demise to justify the means?
If I intend to murder Juan, and I know that Maria will suffer in my intentions, should I kill her too to make it less cruel?