Why?

We have to understand that both Islam and Marxism are bodies of absurdities.  And those believe absurdities will commit atrocities.

There are those who still seek to establish a Communist state in America (with themselves holding the whip, of course) even though Communism has been proven to be toxic to human life.

Islam is not submission.  Islam is in fact systematic and nihilistic aggression against Humanity and all aspects of Human life.