Capitalism is literally predicated on "you should take for yourself at any cost" and does everything in its power to limit anything that might bring consequences.

I wonder if they had any particular reason to think that supporting the "lesser evil" wouldn't accomplish that.

Not one of these “Self-righteous leftists” have addressed my question about what happened to leftists in Germany or Italy when fascist took power there.

Because your question implies that selfish concerns ought to outweigh principles...