A compelling answer to this question is found in David Galula's classic work, Counterinsurgency Warfare: Theory and Practice. ... As Galula explained, one of the main advantages that insurgents have over the governments they seek to overthrow is their lack of responsibility for governance. Far from seeking to govern the local population, the goal of insurgents is simply to demonstrate through sabotage, terror and guerrilla operations that the government is incapable of keeping order. And it is far easier and cheaper to sow disorder and chaos than to maintain order and secure public safety.