I don't recall a single one perpetrated by a JW while on the door-to-door ministry upon children of the household. I simply don't recall a single one.
That's probably because Witnesses generally work with someone else when they're out in field serve-us, hence that would make molesting a child while knocking on doors very difficult. However, does it really matter? Some creep at the Hall might be molesting a kid at the Hall or a niece or nephew or even their own child. After committing this dispicable act, they then go off and present themselves as a 'minister of God' offering someone the chance to join the 'one true religion'. And as we've all found out, pedophiles in this religion are allowed to go out knocking on doors even when the elders and Crooklyn know what they've done which is just as sick as what the molestor does himself. And I think that is the point Marvin's article: That that nice man at the door who's offering you a free home bible study, could very well be a child molester; his church knows it but they still allow him to go out and preach at strangers' doors.
I still really find it hard to understand how anyone who truly believes that they are a 'true Christian', could possibly do something so horrifying and then get up there on the platform giving talks, or go out in service preaching or even be on a JC where he sits in judgement on someone else whose crime is nowhere near as bad......