Worthless law enforcement.. ahem, I mean, crime-creators! Cops are too lazy to do real work. That's why they count so much on information instead of investigation. Feckless, for sure.
How to keep your children safe: Do not let them post ads on craigslist.
How to keep yourself safe: Stay as far way as possible from any government official.
P.S. A husband and wife engaging in an intimate act, in their car, in their driveway, would be required to register as sex offenders if caught. Would your children really be any more safe in that case?