How come in the Inca society were no thieves?

The Incan empire differed form The Aztecs and Mayan civilization in the way in which the human society responded in a unique way to its formidable land.
The Incan  empire comprised modern Ecuador, Peru, Bolivia, Chile and  northwestern Argentina.
The boundaries of the empire had a land of desert in the West, the rain forest to the East, and between these extremes the high plateaus and glacial peaks of the Cordillera of the Andes, which formed the central line like if we compare these bodies of land to our human body, the way of the mountains formed the spine in which the whole entity connected itself.
They created a true empire with a sophisticated 14,000 miles of paved roads that helped to unite the many ethnic groups that formed the empire. They encouraged independent kingdoms to join their empire peacefully.
The Incan empire was rural, centralized, and its primary medium of exchange was labour. Cheaf among these were safeguards against famine, which only a large state with good stores and communications could provide.
The system that they developed may seem laborious to our point of view, but it really was the creation of a society that produced the world's finest weaving and set great store by the practical and metaphorical properties of thread. They maintained their records with great accuracy, unfortunately the invaders characterized by a high level of ignorance, destroyed whatever they thought it was the work of witchcraft. This is the reason why little is known of the Incas' intellectual life. They kept their records by quipu, a sort of medium in which only the statistician and chroniclers were the ones who ran it.
The Incas had an advanced arithmetic using zero and place notation. They were familiar with the counting in tens and so on.
When the invaders saw the way in which the Inca society moved on, they were so surprised that there were no thieves, no vicious men, no idlers. They showed so much wisdom and committed so few crimes that no evil thing was found in great scale among them.
The society was based in the belief that peace and prosperity only embraced them when each one of them were purified of any evil force  acting in them.