What a horrible story.
I don't know what these boys are like now but I know violence begets violence...these boys must have been terribly abused at home to get like this....it is a vicious cycle.
If you grow up with abuse and no love this is what happens.
We in society must help kids when they are small before this happens to them.
Wanting to torture these boys now does nothing to 'teach them a lesson' sadly they are most likely damaged and more violence will only cause more anger to burn in them.
I doubt prison has helped them at all....in my opinion it started with their parents.