Contrary to popular belief, laws and regulations aimed at keeping criminals at bay are largely worthless, or at the very least inferior to measures individuals can (and should) take to protect themselves.
Violating someone's rights to life and property is immoral regardless of whether or not some legislative body passes laws making it illegal, and far too often these laws are used to round up the innocent in addition to the guilty. See sobriety checkpoints for a case in point.
Given the freedom to innovate, private companies will provide products that will keep us safer than the State ever could. For example, there's a new product on the market called TrueCall, a gadget that filters telemarketers' phone calls -- those "cold calls" we often receive at the most inopportune times -- and those attempting to get us to divulge personal information to identity thieves and other criminals.
... TrueCall, created by former telemarketers Steve Smith and John Price, intercepts all your calls and classifies them as either good or bad. Numbers on your 'star' list go through without hesitation every time, while unknown numbers and those on the 'zap' list are put on hold. The system asks those calling from an unknown number for their name, forwards the call to the user's phone, and gives them the option to either take it or reject it.
Much like the innovative detachable faceplate for car stereos did more to prevent car break-ins during the Eighties than anti-theft laws ever did, TrueCall is a market solution that would render government-sponsored "do not call" lists irrelevant.