Josef Fritzl was terribly abused as a boy, he was degraded and made to feel like a nobody, without love. So in order to have those feelings of power and to be needed he imprisoned his daughter and used her as his sex slave.
I don't hear any sympathy for him.
Most evil bastards who are violent/aggressive/sexual abusers/killers come from that kind of home environment. So wife beaters may have witnessed their mothers being beaten by their fathers. Sexual predators may have been abused as children. At which point do you lose sympathy for them? How old do they have to be before they take responsibility for their own actions?
And yet not every child who has been abused grows up to become an abuser. At some point in your life you do make that choice. I guess it's harder if you are surrounded by violence, but there is a point when you realise that it's not 'normal', when you realise that this kind of behaviour is punishable by society and you choose then which way you want your life to go.
The way these children did this makes me think that they didn't think about the consequences. They probably didn't think that the police would come and put them away. It was just something they did. It makes you wonder what else they did to get to this point. I doubt this was the first time they've been violent or aggressive towards others. There would have been warning signs, incidents at school, with neighbours etc.
There is a chance, at 10, that they can be rehabilitated. It's a scandal that now they've committed this heinous crime, they will receive the treatment and care that they should have received before. It really depends on their awareness. There is so much damage that can be done to a child - when is the cut off point? When would you say that they are beyond treatment?
I've a feeling that the way this society is going, we'll see a lot more of these crimes.