Several random points:
Some of the earlier pages kept using terms like "registered sex offender" which of course is not applicable to the current Brass Caption Head at Cadets (and formerly the caption head at Cavaliers and Troopers, and former drum major of Blue Devils) - I believe that probably was a conflation of reports on the Pioneer Reddit thread of them having hired someone who actually was on the registered sex offender list. I don't know the details of that person.
Background checks, including FBI and fingerprinting, are woefully inadequate (have done the research in running youth sports clubs), and in any event still leave the ultimate decision as to where to draw the line on hiring with the club/corps. They're for the most part merely a "cover your butt" step.
The OP, who posted the same on the Reddit thread, very much appears to be following a course of frequent posting under throwaway anonymous screen names both here and on Reddit. You'll also note the "DCIPetitioner" does not include his/her real name in the Petition - which of course undermines the credibility of a petition in the first place (i.e. - "Everyone needs to sign with their name to get this done ... except me, who wants to remain anonymous). The OP's goals, if indeed the OP is the same actual person responsible for many other posts/threads, do seem very much about attacking the Cadets as much as beating the drum about protecting the children.
Yes, DCI, WGI, schools, all seem to have more than their share of people who should probably be restricted from participation within those organizations. This thread alone has mentioned the Cadets brass caption head, someone hired by Pioneer, the Asst. Direction at Crossmen. There was a DCP thread in 2010 about someone arrested for having sex with a minor at his school, and that person is currently on a WGI staff. The former husband of one my son's prior music teachers was busted for having sex with the drum major in his high school band. So yes, I don't have a problem calling for DCI and every member corps to institute an appropriate policy in black and white explaining what prior actions will disqualify someone from employment.