There was a psychological study done many years ago, that put a large group of rats in a cage. The daily food allowance was the same and never changed no matter how many rats were in the cage. The more crowded the cage became, the more violent the rats became. The more rats there were, the less food there was and the violence escalated even more.
So it is with man. Without the basic needs, he will find a way to get what he needs to survive any way he can.