Stevenson has studied a lot of world history. Clearly not all, but a lot. And from all of this potentially useless knowledge, there can be three premises which lead to one, deeper conclusion...

1. There is suffering and injustice in the world

2. Life is not fair and does not need to be fair to exist

3. You individuals actions, big and small, have an impact on the world, for good or bad

Final conclusion: despite genocide, there is hope for the world...

Woah...