You can hire all the private security in the world and it won't do anything since they can't do anything more than the police can.
There's no repercussion due to depolicing, which includes policies to not prosecute crimes by the respective DA of whichever city we choose to talk about. Even if the ne'er do wells get charged, they'll just get released with a summons to appear in court, and they'll never see the inside of a jail or any sort of actual punishment to discourage their behavior.