Everyone keeps mentioning "rapists and pedophiles" but for all those who ARE on the sex offender registry, such a registry still hasn't stopped the NEW sex crimes from happening. People with NO PRIOR CRIMINAL RECORDS are turning up daily with sexual offenses of ALL types. 
And how about those college frat parties where drunken lovers are engaging in sex? Did any of you know that being intoxicated and having sex with even your own GF or wife is a CRIME? Bet ya didn't know that.
Or how about the lovers who get caught having sex in a public place? I used to have sex with my GF in the back seat of my car back when we were in high school. The cops caught us once and told us "get dressed and get out of here". Today, post "Megan's Law" we would BOTH be on the registry. How are we a threat to the precious children and the safety of the public by having sex with each other in a car AT NIGHT TIME in a dark "park and ride" parking lot? To say we were a threat is ridiculous. The SOR is just $$$.