Somewhere around 1300 children a year are killed by their parents with an average age of 2.8 years. Certainly we support Megan's law. If Megan and her mom had known that that sex offender was living near their house, she would be alive today. There has never been anyone cured of being a child molester. Every offender is a risk, we have to know who they are and where they are.
Different states have different laws.
Some states like WI or MN are very good. Other states don't make a pro-active approach to notify the community. Some states like CA and VA have it on their web sites FL too. There are also some children's organizations that don't even do background checks, and if you're a sex offender, you could walk into a club today and be coaching a girl's basketball team tonight. Children in our society, not too long ago were considered chattle, property.