Sadly, sex predators exist at private and charter schools too. You will find them wherever you find their potential victims. Most, like this perv, have no criminal record. Thank God the boy had the guts to turn him in. I am sure it was not easy for him.
Upon reflection, I see the ugly truth of what you say. I had been focused upon the public "schools'" aggressive and enthusiastic hiring of homosexuals and considered that to be the greatest threat, but after considering your words I'm thinking that it's possible that the opposite may in fact be the greater potential for trouble.
Although homosexuals and other perverts have had the Official welcome mat rolled out for them at public schools, parents are educated and extremely wary of this. Such a stealth pervert will likely be under a far greater shadow of parental distrust .in the public school setting, whereas private and charter school parents may be more likely to be laboring under the false impression that teachers at their schools have been more aggressively vetted and are 'safe'. A stealth pervert who gets into such an environment will likely have more opportunities to get 'closer' to victims, as the parental guards may be more relaxed or perhaps even absent.
Thanks for your post, distressing as it is.
It seems that the only way to insure the safety of children is via a 100% homeschool education.