It is a good subject to bring up.
Chris commented once that I drive much more aggressively in San Diego that I do elsewhere - I started paying attention to that.
My local commute varies, I know every route I can take, and I hate every second of it. It annoys me to no end when, say, somebody slams on brakes in front of a Yield sign where clearly there's no cross traffic for half a mile in every direction.
But...
It could be a kid, or it could be a lil old lady, and they just don't have the same perception of traffic that I do. And the road exists for them just as much as it is for me. Even someone on the cell phone may have a very legit reason to have this conversation right there and then.
Watch the Russian car crash videos, and count how many accidents could have been avoided if the drivers did not insist on having their right of way.
There are counter-examples, but few and far between.