Rationality takes extra time and effort, and most people can get by without it. It is easier to go with the flow -- easier on your brain, easier on your social life, and easier on your pocketbook. And worse, even if you decide you like rationality, you can't just tune into the rationality hour on TV and do what they say -- you actually have to come up with your own rationality! It's way harder than politics, religion, or even exercise.