Aside from the #1 aspect of safety and good airmanship, I tend to think that a pilot's superiors (i.e. more senior pilots, chief pilot and/or company owner) and their attitudes have a lot to do with it.
If the boss is a good one, it's going to be hard for a pilot not to follow the example being set. Unless the morale is low or some other hindrance is playing a role.
520.