They go hand in hand.

The only thing worse than a culture of credulity is a culture of mistrust. Just check out the Arab world.

Money Q:

"This culture of credulity did plenty of damage to the economy, but now it has given way to something even more corrosive; namely, endemic mistrust. Because if there’s one thing worse than too much confidence it’s not enough. Fraud impoverishes a few; fear impoverishes the many. As long as mistrust prevails, people will keeping pulling money out of the system—sometimes even at gunpoint."