If JW's were totally honest, they would have to admit that they are instructed - directly or indirectly - not to even listen to teachings/arguments/debates which conflict with their "faithful slave's" propaganda.
The WTBTS's "truth" is so weak that its adherents cannot have a serious Biblical discussion to defend it.
Even the trolley-zombies are programmed to "avoid arguments" by directing questioners to the JW website.