They say that like it's a bad thing.
But seriously...
There hasn't been one incident of a sex offender being harmed as a result of being listed on the State's site. This is probably because the site is rather useless for determining a threat level from a given individual. You can see who the offenders are, their ages, and where they live; but, you only get a vague idea of why they're listed. No case information is given. A 48-year old subject might be listed as having been convicted for having sex with a minor, but you don't know if he forced himself on some poor kid last year or got caught with his 17-year old girlfriend 30 years ago.
The 'Megan's Law" site gives much detail including age, date of conviction, nature of crime, etc. It contains info for Pennsylvania but I don't know about other states.