Great, so these people who you're not okay with putting in cages, the ones that go out and kill other people (for drama's sake), or just really grief society with constant home burglaries, maybe some drug addictions driving that, maybe assaulting people to avoid arrest, maybe "accidentally" killing someone with that gun they use to threaten the cashiers - no cages for them, either? I 100% agree, they're still people, they deserve the best possible shot at becoming better integrated members of society, rehab programs instead of incarceration when appropriate and all that, but even with the amazing money saving rehabilitation rate of psych counselling for drug convictions (which a friend of ours does for a living), they're still far from 100%. Our courts throw too many under the jail for no good reason, wasting their lives and costing the community far more money than the shot at rehab they deserve, but at some point, rehab isn't working for some of them - then what?

Of course there are literally thousands of other "common" anti-social behaviors that eventually rise to the level of incarceration as well...