Zombie has something to say on the matter, if any cares.
I agree... with both sides, to a degree. I've always believed that life in prison is the worst punishment then the quick death, and if it is avoidable, one should never have the right to kill another. Though, you have to understand Frost, his death is more theatrical (though personally, I prefer the idea of him suffering in prison with he knowledge that he lost, and everything he has work for has come to naught.
So keep that in mind with what I'm about to say, because I do agree with you in that regard.
However, I see no justification in what he does. I can see what you're saying in regards to Lusett herself, but not her children. Elene and the others should not, can not, be expected to be held responsible for what Lusett did, especially since she is done. I don't like to go there, but decided that an entire group of people should die for past transgressions they weren't involved with... kinda Nazi-ish.
I never,
never, quote religious text in fear of offending someone, but this is the best way of putting my thoughts on that matter:
“The son will not bear the punishment for the father’s iniquity, nor will the father bear the punishment for the son’s iniquity; the righteousness of the righteous will be upon himself, and the wickedness of the wicked will be upon himself” (Ez 18:20)
Or, if we want to go with a more sci-fi reasoning, here is a quote from Star Trek Voyager:
[in a vision, Chakotay is talking to his father about his and Seska's son]
Commander Chakotay: He was born without my consent. I had no part in it.
Kolopak: No part in it? Well, it's been a long time, so forgive me, but it seems that I *had* to play a part before your mother could conceive.
[...]
Kolopak: Centuries ago, when the women of our tribe were raped by white conquerors, many gave birth to their children. And we did not reject them. They were accepted by the tribe. One was a direct ancestor of ours, Chakotay. His name... was Ce Acatl. He became a great leader of our people. Here is a man who was given life without his mother's consent. Are you so different from her? And is your child so different from Ce Acatl?
Commander Chakotay: [after a pause] No.
Kolopak: Mm... He is your son, Chakotay. And he is a child of our people.