While not attempting to defend sex offenders or predators at all, there is a real issue as follows:

Where should sex offenders / predators reside?

How do residency requirements / restriction laws hold up against home ownership rights and other civil rights of sex offenders / predators?

What is the role of the city, county, state with respect to these issues?

What laws are constitutional as to these issues?

You can read more about the efforts by Florida residents to set up a day care center to drive out sex offenders at Day Care Center Planned for Orlando Area Neighborhood.