I don't think it is about getting them to hear what we are saying. It is about getting them to think about stuff that they already know about, but are suppressing.
They want Jehovah gOdd to hurry up and bring Paradise, but they don't really like the idea of innocent kids of non-JWs being indiscriminately killed, so they try tricks to minimise these deaths to themselves, or to blank out the thoughts. Our job is to pick the scabs off their faulty repair jobs and get them thinking about the WT crap they are being fed.