I really don't think that there is such a thing as the "JW mindset" unless we were talking about individual foibles like a lingering aversion to holidays or entering churches.
We could point to traits like "being cock-sure that one has the truth" or "judging others without compassion", but the fact is... almost everybody in the world does this. It's human nature. Ask the people around you who they voted for in the last election, then ask them why. Present them with facts that oppose their view and see how they react. Ask them why they picked their religion. Ask a non-religious person if he ever explored religions. It's also not hard to find racism lingering in the corners of people's minds.
Everybody tends to think they have the truth and everybody tends to not have compassion for foreign people (they might claim to, but what do their actions show?). Anyway, those are just a couple examples of how the traits we dislike about JWs are found in the general populace. Even if we picked "believe that a doomsday is impending", there are plenty of survivalists out there, and many everyday people who have a tendency to feel like the world is sliding towards oblivion.
Very few people besides those of us who have been fleeced and had to re-educate ourselves from scratch even have a chance of escaping that satisfied mentality and realizing that skepticism is needed in all areas of life.