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They are trying to say he is bad and unamerican because communism is bad and unamerican. He is bad, but he is probably the most USian person I can think of. Man is basically a walking US cliche.
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They are trying to imply he is a Russian asset and think Russia is still a communist country. It is unbelievable how many people make that mistake. McCarthy would be proud.
They just want to try to justify a nuclear first strike by painting a scenario where Russia would not retaliate.
If I found out tomorrow they were actually just nihilists that wanted nuclear war to end all human life on Earth, it would make more sense to me.