Breaking the Cycle: Barnardo Adverts

I thought these were powerful adverts from children's charity Barnardo's:

http://www.youtube.com/watch?v=vyYarPB7OM4&NR=1

http://www.youtube.com/watch?v=-b1Y1CrNWgU&feature=related

What do you think of them? What does cause someone to be "bad" and how should society deal with such isssues?