I tried to use the Mrs' phrase "JWs are Amish with make-up"..but that just doesn't get across the "us vs them" mindset of JWs.
I use the Almish to explain things to people. Thanks to all the programs on TV about the Almish, more Americans are familiar with what it is like for a person to leave the Almish or be kicked out of the Almish.
People understand that it is like being kicked out of your entire world. And that is what it is like to be DF from the JWs. The JWs are a closed society, just like the Almish, and being kicked out of the JWs is like being kicked out of your entire world, all your friends and all your family as if they all died at once....just like being kicked out of the Almish.
The only difference is JWs use modern technology, have jobs out in the 'world' and so on. So it looks like the JWs are not closed off. But make no mistake about it: Though you see them out in the world living, the JWs don't really LIVE in out in the world. They LIVE in their closed community, just like the Almish.
And, just like the Almish, being kicked out of the closed community = being cut off from GOD Himself. It equals going to Hell (though JWs don't believe in Hell).
What could be more frightening then losing ALL of your family and friends at once(as if they all died) and being damned?
ETA: I guess I didn't really address the question in the OP...I was more focusing on the question in the title of the post. So I will add this:
Just like the Almish, the JWs are told to report things to the elders and to follow the rules and that is what they do. They trust their elders to handle things. The elders are their 'higher authority.'
The Police are just 'the world' and the JWs don't live in the world. Just like the Almish. (the Almish don't report their child abuse to 'the English', either.)