Rationality is emotionless and mechanical. It's about making a reasonable decision based on whatever information is available to you. However, rational decisions do not involve morals, culture, or feelings. This is exactly what companies like Google and Goldman Sachs are being criticized for.
When game theory is baked into your corporate culture, this is what you get. The company starts an inevitable slide from "Do No Evil" into "Make the Best Decision You Can With the Information You Have".
If I look down into my wallet and see no money there, and I'm hungry for lunch, and I decide to steal some money from a little old lady, that may be a perfectly rational decision to make. An outside observer may say I'm being evil, but they don't have a complete information picture about how hungry I am, or how long the line at the ATM is, or that everyone else is eating lunch so I have a duty to my shareholders to do the same.