Evil regimes

I think the world, or whatever part of it has the ability, has a moral obligation to stop evil regimes in the bud.  Not only do they tend to fester and infect the rest of the planet, but human decency calls out to help those they brutalize.  The fact that evil regimes in the past have been allowed to fester this way until they became calamities should teach us a lesson.

Of course it doesn't always happen -- it takes a lot of leadership and usually it requires them to present an immediate danger -- which tells us sad things about humanity.