Not sure which post you are referring your question too, but, ...
Hitler was generally a Socialist, but more specifically a Communist that adjusted his Communism to his own benefit by imposing National Communism rather than International Communism. That meant that after he took control of Germany he became the Big Boss and did not have to turn over control to the International Communists in Moscow, convenient, no?
OK, so he now is top dog with National Communism which he cleverly calls National Socialism, but he has central control.
Fortunately for Hitler, early on he realized that Communist central control won't work, so he "partnered" with businessmen and industrialist cronys to direct industry like Moscow Commies could not.
Bingo, German arms and industry explode, Hitler has his centrally controlled war machine, and political observers describe it as "Fascism" and National Socialism, but it's really far leftist political (rather than economic) policy and closely related to Communism.
Hitler, for all of his flaws, was not a Communist.
I could also point to the French Revolution, during which numerous atrocities were committed.
Communism and Islam are iterations of a larger phenomenon.