That's if the guy was even guilty of molestation. Dennis raises a good point in post 2--how did he have access to a two-year-old? Unless the parents are seriously whacked, they wouldn't have had the guy babysitting--he's described in the article as an obscenity-spouting alcoholic who liked to parade around in the nude. Unless there's a lot more than we're told in the article, it sounds like the husband acted in way too much haste.
Maybe some other person baby sitting was not clued in to the nefarious neighbor, who kindly offered to watch while baby sitter went off to a movie or whatever.