You could call them stupid, but a lot of people who thinks this way has some major issues to deal with... They let anger, personal feelings, pride and their own prejudice get in the way of making good decisions. Sometime, there are more important thing than pride. And lying isn't easy to do...like Garak said: it takes practice to skillfully lie and get away with it. Often time, in a lie something just don't fit and doesn't make any sense. Whereas the truth fit perfectly into the story like a puzzle. And a lot of people think you have to cheat and bend the rules to get far in life, but the truth is honesty works the best for doing business. If you keep thinking diviously, you tend to associate yourselves with crooks thus getting in knee deep in crap like we see with the U.S. and the Al'Queda. Crooks are noctoriously untrustworthy which always, if not most, create undesirable results in an attempt to get a better part of the deal.