Consider also the politics of the Neo-Nazi novel that inspires many of these killers. It is called the Turner Diaries. The book got a lot of attention after the bombing of the Oklahoma federal building because it was a favorite of Timothy McVeigh's. It has been said that the book advocates the killing of federal officials. In fact, that's just the initial hook.
Conspirators wipe out all their enemies, which include anyone who opposes their rise to total power.
After taking over, they restart the calendar at the year zero, a goal associated with every socialist thinker from Rousseau to Pol Pot. Also in the book, businessmen are portrayed as a greedy class that puts money before race, and Christians are demonized as stupid and evil. In the U.S. of the future, all free enterprise and free trade are abolished. Instead, we get a central-planning regime that distributes all resources, including food, on an equal basis. The citizens are pliable subjects of the socialist elite who exercise total power.