As others identify, this is somewhat of a subjective matter.
When we view some as "deserving" to die, we have opened up the gateway to say that any human flaw should be a matter to bring death and destruction.
We ignore the possibility of redemption. We imply the right of judging, which would come from some clear superiority. Such superiority does not exist. We ignore the causal factors that cause bad behavior, and we ignore shared and social responsibility. We blame individuals instead of collective problems.
This flawed approach is a colossal part of our moral paucity and global crises.