JWs have no such qualms when they undermine the faith of the people they recruit into their cult. In fact, they do it so subtly that the person is barely aware of them chipping away at beliefs once held.
They start with the traveller/map analogy. Then they teach you that God has a name, just like you and I do, and that their religion kept that knowledge from them. They plant seeds of doubt and capitalize on those doubts.
Yes, it ought to be a heavy responsibility, because of the potential to create rifts in the very fibre of family units. They've turned wives against husbands, children against parents and grand parents, destroyed perfectly good friendships. They've separated children from grandparents, aunts, uncles and cousins. They've convinced people to sacrifice their lives in a medical emergency, to allow their parents, spouse and children to die for lack of blood transfusions.
They will destroy you if - once you drink the Kool-Aid -you try to leave. They'll turn your family against you; loyalty to the cult is #1.
Given all those basic facts, I don't feel the slightest bit of guilt in undermining anything the JWs teach - they've been doing this sort of things to families around the world for over 100 years. It's about time we used the knowledge and resources at our disposal to fight the cult-scourge.