By preventative, I'm describing punishment being used for deterrence purposes, which is where the question of whether also punishing the family is justified com

By preventative, I'm describing punishment being used for deterrence purposes, which is where the question of whether also punishing the family is justified comes in, as it might have a further deterrent effect. Minority report is another "dire hypothetical". Like the author, I'm comfortable dismissing any hypothetical that relies on perfect future knowledge as unrealistic and unworthy of consideration. Unlike the author, I'm not taking a stance on either ends or means based philosophy. Just reacting a bit to what the parent post said.