I quit a few months ago (going back? not sure yet), and it was a pretty laid-back affair. I think what you're seeing is that loud people are loud and laid-back people are laid-back. What I mean is, it's hard to measure people who quit quietly, since they don't make a big production when they leave.

It would be like if you listen to the police scanner and determine that everyone is a crook. You only hear about crooks on the police scanner because the police don't make a fuss about law-abiding citizens.

(the latter example is a generalization, don't jump all over the details and miss the point of the example)