I have no doubt there are pedophiles in the school system. I also have no doubt there are pedophiles in churches, nurseries, pre-schools, gym, sport clubs, day camps, summer camps, tutors, after school care - where ever there are kids, there will be people that want to prey on them. This article exists only to inflame, not to give useful information or even reliable information.
Those are not publicly funded for the most part are they? Different standard... What threshold do you expect when an applicant checks "yes" for child abuser and is still hired? NEA cover-up IMHO.