There is no limit to suffering human beings have been willing to inflict on others, no matter how innocent, no matter how young, and no matter how old. This fact must lead all reasonable human beings, that is, all human beings who take evidence seriously, to draw only one possible conclusion: Human nature is not basically good.
Given the amount of unjust suffering and unhappiness in the world, I am deeply grateful for, sometimes even perplexed by, how much misery I have been spared.