Americans and knees don't mix.

Americans appear to be such an untrusting lot. What is it in their national psyche that drives them in that direction? Is it because they can't differentiate between accents? Is it because as a non-miliatary short wearing peoples they are unable to grasp the concept of knees at war? Is it because the British are good at that kind of warrior presentation that Americans shun the idea? Or is it an extension of their origins in Puritanism? One thing that is for certain is that they appear to value suspicion.