[vacri]

And why everyone believes we need central authority in order to achieve something?

An ant colony is a life-support system for a queen. You're lionising a feudal system, where the life of the commoner is meaningless and dangerous, while the nobility is pampered and insulated. All the commoners are achieving is continued life for the nobility, and they do so frequently at the cost of their own lives. They are entirely disposable.

Similarly, the 'complex structures' that ants build are mind-numbingly simplistic, when compared to the ones humans create.