A lot of people are very anxious (& vocal about it).
A lot of people are a lot more cautious (that me) about everything, and they believe that following rules is important to make sure the right thing gets done. They actually believe in the power of bureaucracy & paperwork to make the world a better place.
People believe that risk can be controlled or eliminated.
Many women measure their self-esteem by the size of their breasts.
Capacity for self-deception is huge.
That people don't listen (read)... and they project their issues onto other situations that are nothing like their issues (or at least, not proven to have anything in common).
That projection thing is huge, actually.
A lot of people don't understand that cats are territorial. 
Unhappy people are the loudest people.
How much British people like to moan, and like to celebrate group moaning.
(flipside): many people are amazingly creative & witty, much more than me. Many comprehend guts of situations much faster than I can.