In all honesty, I think the only thing they regret is being caught. To be so callous & cruel at such a young age can only, in my opinion, mean that they are never going to be rehabilitated onto decent human beings.
As for them being released & given new lives & identities, I feel that was wrong too. They are now far removed from the scene of their crime, being educated & found jobs. This doesn't seem very much like punishment to me, more like reward.

For all we know, they could be on this site now reading these answers.

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