The thing that worries me about this is the actors. What do you do if one of them lies to seem like he's been reformed, but still harbors his original ideas?

At the root, though, I believe this is a better route than just killing them all.

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"When in the course of human events it becomes necessary for one people to dissolve the political bands which have connected them with another, and to assume among the powers of the earth, the separate and equal station to which the Laws of Nature and Nature's God entitle them, a decent respect to the opinions of mankind requires that they should declare the causes which impel them to the separation... We hold these truths to be self-evident, that all men are created equal, that they are endowed by their Creator with certain unalienable Rights, that among these are Life, Liberty and the pursuit of Happiness...."
- The Declaration of Independence