It seems that insects like ants can take more rational decision than animals, including humans. Susan Edwards at Princeton University and Stephen Pratt at Arizona State University, reporting in the Proceedings of the Royal Society B (published online), have looked at the collective decisions of insect societies.
“Problem solving by insect societies relies on highly decentralized information processing. This partly reflects cognitive and information processing constraints: individual insects cannot handle these problems alone, and colonies lack the hierarchical structures that might foster centralized decision making,” the researchers write. “On the other hand it has long been recognized that the decentralized design of insect societies offers great benefits in robustness and resilience. The
results of this study support another advantage: the filtering out of systemic errors that would otherwise arise from the cognitive limitations of individual animals.”
Collective rationality : Current Biology (2009), Volume 19(15), R629-30.

It seems that rationality of ants’ decision arises from de-centralization of decision making process. Colonies lacking strict hierarchical structure helps in this process. Each individual has its own preferences and they exercises it.
If we, humans, have same information and same choices as others, and if we are allowed, we probably will make more rational decision that maximizes our fitness of survival and development as a community. Will it be justified to say that more tendencies we show for centralized decision making, more we will face frustration and many other seemingly irrational behavior. The countries that broadly follow true federal structure (e.g US or Switzerland or Singapore) have a much better social fit to prosper?
Will we ever learn de-centralized decision making and make better, more rational decisions?