I wouldn't be so quick to blame changes in laws, though. In my experience, property crime is up because the police don't do anything when they get a report of a theft or burglary. If there's a fight, drug deal, or even just a drunk person stumbling around, the police will be out in force. If somebody got robbed, well, good luck, they'll take your statement and then you're on your own.
Now, perhaps that has to do with incentives and the police knowing that the offender isn't going to jail even if they pick him up for burglary. But it seems like there could still be a healthy middle ground where property crime offenses still result in fines, restitution, community service, and probation without needing to lock kids up in prison.