Humans tend to behave in a predictable systematic, unsurprising irrationality based on emotions and social norms that influence the economic behavior in individual motivation. Human behavior is driven by two opposing motivations, the want to view oneself as honest and honorable but willing to deceive or mislead for benefit. Human behavior is a balance between two forces. Irrational behavior is one part of human nature. Humans are not rational but make bad snap decisions, deceive or mislead and let emotions rule. Trust in social or business situations drop as human populations grow but there are limits to which an honest individual can stretch his dishonesty or what is considered acceptable acts of being dishonest. Humans react differently when stressed and make different decisions than when cool headed. Humans are not perfect so to lie about something doesn't make one bad, it simply makes us human. Humans who are emotionally or physically exhausted are more likely to deceive or mislead. Deceit can spread like a virus within some organizations simply because deceit is a part of life. It's not always about personal gain. Routinely one will not tell someone how they really look. Humans tend to value truthfulness highly but also value loyalty. When other humans you care about tend to gain from you being dishonest, you're more likely to be dishonest. Companies make cost-benefit analyses for gain from outside-the-lines behavior and the potential consequences and forestall bad behavior by putting punishments in place.