I think the problem lies with the witnesses world view. Witnesses put on this facade of being the ONLY 'wholesome, clean' group of people on Earth. They are 'God's chosen ones'. They don't associate with those outside their faith because they are 'worldly' (full of the most heinous of people). Yet, inside is a supposed spiritual paradise....good people who are trustworthy, people that ones would be willing to die for. Therefore, people who are zealous witnesses have a tendancy to trust each other without question, unless someone is just a total creep. Problem is...not all sex offenders are your typical 'chester's'...unless you were told, sometimes you would never know. If a 'situation' come to light, the Police are not called, but the WTS is on speed dial.
Churches from what I can tell know that within their walls are all sorts of people, they aren't as close as witnesses in their dealings with each other. Not that they aren't a close 'church family' but they aren't exclusive. Their world view isn't to trust each other with their lives. I'm not aware that churches would 'announce' anything should a sex offender go to church in their doors. But, the offender would not be in a situation where they would deal with or come into close contact with unsupervised kids...(criminal background checks) If a situation came to light about a pedophile situation, you can bet the authorities would be called immediately.
Witnesses have an open acceptance - once you are in the group it really is a 'you are one of us' attitude - no questions asked - the worst witness is still a witness...and on God's side. Once they know someone is a witness, walls go down and you are a 'brother'. 'Spiritual brothers and sisters' are viewed as closer than family. The amount of trust a naive witness gives to other witnesses is dangerous. People who are raised in and know no different are those who I call naive. They are told what to do their whole lives and haven't developed any type of street smarts at all....not necessary when all decisions are made for you.
The WTS is responsible for making a group of people who are susceptable to this...they have made their bed, and now they are sleeping in it.
There is NOTHING they can do now to change what they have created! They haven't focused on 'self-growth' with individuals, it was all about the growth of the organization. They are guilty of focusing on themselves (the organization) and not the people...and they are paying the price for only caring about the organization.