I'm sure that some people find MISTAKES WERE MADE (BUT NOT BY ME) to be an enlightening read. And, hey, maybe a few years ago, I would have found the same thing. But now? Not so much.

Honestly, you can basically sum up the entire book by remembering these two things:
1) We make bad decisions because they'll make us feel good in the short term
2) We do bad things (such as lie) because we want to feel good

That's it. I guess that if you need to hear those two things in more words, then you should read MISTAKES WERE MADE (BUT NOT BY ME). Me? I already knew that and didn't need a three dollar book to tell me them.