I do think that part of the mind control aspect is the way that for years individual witnesses would write to the HQ and ask questions that they should have made personally. Can I watch this type of movie? Is this music appropriate for Christians? Can I eat this type of food? Should I tip my hat to a member of the opposite sex? etc...
The WTC assumed the role of dictating what was appropriate or not. Think all those convention talks about dress and grooming, which were then reinterpreted by local elders either harsher or milder depending on the type and overall age of the body of elders.
We still know brothers who are in their 70s who upon learning about a new craze in the local community immediately respond with "I'll need to talk to (name of current presiding overseer) about it" instead of having an opinion like normal people do. FFS.