These KIDS in the alt-right live in the ruins left for them. They understand the war is for their VERY EXISTENCE. We can't spare them, they fight.
However, there is a third element, lumped in with the Right and aligned with it due to a common element of opposition to the Left. However, this element lacks the core of Christian and individualist values of the other two factions. This element is the nationalist, white separatist tendency, e.g., Richard Spencer. This type has generally only been marginal in American history, with the singular exception of the 1920s version of the Ku Klux Klan, which was massive in numbers but very disorganized and subject to the unremitting hostility of the over one-third of Americans who were Catholic, Jewish, black, or liberal in either the classical or modern sense. Had the Klan had better national leadership, it could have become an American version of Mussolini's Blackshirts. As in Italy, Germany, and other European nations, there was a leaching of the traditionalists into the radical nationalist camp. Many of the Klansmen of the 1920s were educated professionals who were horrified at the radicalism of the Wobblies domestically and the Bolsheviks in Russia, the loosening of moral behavior, and the massive influx of seemingly inassimilable southern and eastern Europeans. Many of Mussolini's and Hitler's supporters were traditional Christians and monarchists who saw the fascist parties as effective fighters against the Left.
The Left has something of a unified vision of a secular, collectivist one world utopia. The principal difference is the methodology. Someone like Hillary Clinton would achieve it through manipulating and transforming additional structures and using crony capitalism. The antifa types would level all existing structures and destroy the upper classes. During the recent anti-Milo riots in Berkeley, the rioters attacked Starbucks, a company where the recently fired chairman was notorious for leftist virtue signaling. Yet when you get down to basics, the Clintonites and the crazies are a modern version of the Stalinist vs. Trotskyite conflicts: common goals but much different ways of achieving said goals. The Right lacks the unifying vision that the Left has.