Overall, this was a frustrating book. It gave a lot of interesting information, but it failed to answer the specific question it raises in the title phrase: How you explain why someone acts in a way that seems "out of character." They give lots of possible reasons, but they don't seem to recognize the fact that most people do, actually, behave fairly consistently over time, and it's when that changes that people are surprised.
The authors disagree with the old idea that character develops and then is essentially unchanging; the idea that one grows up and becomes a good man, or not, and then basically stays that way. They give a bunch of very good reasons why people change their behavior in specific situations, and how scarily easy it can be to manipulate people's responses by changing circumstances (often very minor ones). Indeed, the best part of the book is really all the descriptions of the experiments designs, how researchers find ways to study real-world situations in a replicable lab environment. That was fascinating.
Okay, I enjoyed the examples, and let's say I buy their argument: Every day a person faces dozens of situations that reveal or demonstrate their character, and they might act differently depending on things as trivial as an aroma I smell or in reaction to something a total stranger did ten minutes earlier. It sounds as though most people are pretty unpredictable, because you can never tell which way they're going to go at any given moment.
But that's not true, and here's where I have a problem: Despite all these variables, most people do behave fairly consistently, even predictably, over time. Honest people generally don't lie, even when it would help them to do so. Faithful spouses remain faithful, even when tempted. Thieves steal when they see opportunity.
Let's say I've paid taxes for years, in all sorts of situations--when I was young and broke, older and doing better, older and with more financial constraints...and yet, I've never cheated. My character (at least in this regard) has, so far, been consistent, let's say for decades.
It would therefore be "out of character" if this year I suddenly decided that Leona Helmsley was right, only the little people pay taxes and I'm now for some reason exempt. So, why now? Why would someone who had displayed a consistent characteristic--honesty--suddenly change? All those fluctuating, changing circumstances and temptations have always been there, so that's not an answer. Why did I suddenly succumb, when I was able to resist for so long? Did I just get tired?
My question, which remains unanswered after finishing this book, is why someone, who has behaved consistently for a long period of time, suddenly changes, and does something we say is "out of character." (Hypocrites who are suddenly unmasked don't count; their behavior didn't change, it was just that their secrets came out.)
I would award bonus points for explaining why that same person either returns to the old behavior ever after (after one inexplicable year of tax evasion, I then pay my taxes properly forevermore) or doesn't (I hire an accountant in the Cayman Islands, and become a permanent tax scofflaw). This book fails to address this, too.
Grr. Maybe they'll have a follow-up.