Download an app for the sex offender registry and see how many average offenders there are scattered around your neighborhood and city. Thousands.
There are 18 million Millionaires and 800 billionaires in the United States alone. Do you think there are no pedophiles among the wealthy? This is big business. There are people willing to abduct and sell children and there are people willing to pay for them. Pedophilia is the real pandemic.
Sex offenders aren't always rapists and child molesters. Some (likely many) were just either drunk and flashed themselves or just got caught trying to urinate in a bush.
Classification can muddy the waters
Yes there's that. Some guy taking a piss in the middle of the country in the middle of the night outside goes on the registry if they're caught.