Have proof for that? We have had phone books for years, and crime rates have been dropping. Not to imply having phonebooks leads to a lower crime rate. Also, you can actually look up information about anyone using a phonebook-like website.
That wont happen. Law Enforcement takes people's information seriously. Publicly, you cant find anything about the person unless they, themselves have posted it.
Phone books are opt-out'ble again, its not impossible to live with anonymity.. just takes some skill.