The 20th cen­tu­ry was cre­at­ed by ide­al­ism. Communism and fas­cism and Nazism are all based on ide­al­ized sys­tems, what the world should be ide­al­ly, and how it isn’t what it should be, and there­fore we’re enti­tled to change it rad­i­cal­ly and take con­trol of it in order to do so.