Every Communist must grasp the truth, "Political power grows out of the barrel of a gun." Our principle is that the Party commands the gun, and the gun must never be allowed to command the Party. Yet, having guns, we can create Party organizations, as witness the powerful Party organizations which the Eighth Route Army has created in northern China. We can also create cadres, create schools, create culture, create mass movements. Everything in Yenan has been created by having guns. All things grow out of the barrel of a gun. According to the Marxist theory of the state, the army is the chief component of state power. Whoever wants to seize and retain state power must have a strong army. Some people ridicule us as advocates of the "omnipotence of war". Yes, we are advocates of the omnipotence of revolutionary war; that is good, not bad, it is Marxist. The guns of the Russian Communist Party created socialism. We shall create a democratic republic. Experience in the class struggle in the era of imperialism teaches us that it is only by the power of the gun that the working class and the labouring masses can defeat the armed bourgeoisie and landlords; in this sense we may say that only with guns can the whole world be transformed.Mao Tse-tung
November 6, 1938
So give the state a monopoly on the use of the gun, and the state, in the name of the "labouring (sic) masses and the working class" will use that to secure its monopoly in perpetuity.