I feel the same, Musket. I wonder if I'm in fact useless at judging character, even after a long life with much foreign travel, meeting thousands of people in my career and poking my nose into prisons etc! I now feel a certain mistrust of anyone, which is a great shame.
It's very interesting that you met both men. Of course, no man has 'Paedophile' or 'Sex Pest' tattooed on his forehead. But one would have thought the intrinsic nature of such a chap would percolate through to one's consciousness. Apparently not!