I don't think you can classify someone who is guilty of wanking in the public loo and getting caught, with someone who molested the neighbor's infant.

I don't think they should be on the no fly list, but probably (the high level offenders) should be required to buy at least 2 premium class seats side by side, at full fare, to keep the prey away.

The public is probably much safer with the perv on the plane than the perv driving around the highways stopping at Denny's, Waffle Homes, and rest stops from sea to shining sea, through amber waves of grain.