Can I just point out, for the last time, and I think I have the right because I started this conversation: "violence" does not necessarily mean physical violence. I could be violent to you right now without moving away from my keyboard. In this instance the very imprisoning of these people IS the violence in question. I mean I'm not trying to skew the terminology in some "specialist" manner. Just look up the standard dictionary definition:
http://dictionary.reference.com/browse/violence
Perhaps our very aversion to what the term violence is supposed to connote is in itself proof of an increase in social disintegration and anomie. This is certainly a case of a term losing much of its value so that people can't even recognise violence AS violence any more...