Well, because these “quiet men” do not “raise their voices”; because they sometimes speak in soothing tones of brotherhood and peace; because, like other dictators before them, they’re always making “their final territorial demand,” some would have us accept them at their word and accommodate ourselves to their aggressive impulses. But if history teaches anything, it teaches that simple-minded appeasement or wishful thinking about our adversaries is folly. It means the betrayal of our past, the squandering of our freedom.
And if you’re too young to remember it or don’t think Communism is evil read: The Gulag Archipelago and Gulag: A History. Also, read this article on North Korea.