A choice: Do you make people in front of you suffer now and watch it happen? Or do you make even more suffering for even more people, far away, at a later time, when you might not have to be there for it? What if you've already been doing this a long time and you're tired? The better people can't handle this choice, so we've never won a war, and monsters have overrun society for thousands of years. We get tired of using force to stop the monsters in front of us, and we let them just go get other people where we're not watching later.