Guerrillas are becoming entrepreneurs. During the Second World War, the resistance forces in Nazi-occupied Europe were engaging in guerrilla warfare. But the term has long been extended to describe armed groups engaged in warfare against their own government. The motivations can be multiple. The Chinese Communists, when they were in Yenan, were this kind of guerrilla movement.
Some guerrillas use an ethno-national justification.
They wish to force the government to permit the secession of a region, or at least the autonomy of a region. The Kurdish forces in various Middle East countries are this kind of guerrilla movement. And some guerrilla movements are simply the expression of a group of people who wish to seize power for their own glory and profit. It is of course not always easy to distinguish the motivations. Furthermore, the people against whom the guerrillas are fighting regularly ascribe motivations to the guerrillas that are different from those the guerrillas claim publicly for themselves.