After millions of years, we seem to have learned very little about how to live peacefully with other human beings, and with the advent of ever more destructive weapons; the amount of people being killed has probably far exceeded that of a few centuries ago plus now we can cover vast distances in just a few hours, so now no area in the world is safe from the possibility of being destroyed.
Children hold the key to the future of the world, but that offers no protection from being killed at a young age.
Imagine There’s No Heaven Thanks John