When Futurism Led to Fascism–and Why It Could Happen Again (2019)

One of the reason futurism led to fascism was that it explicitly considered war as a cleansing of the human race.

I think the futurists had more in common with ideological purists mainly. Nationalism however often evokes the past and history which often conflicts with the purist. Communism is probably closer to modernism in that way.