Perhaps like those in Europe, America's liberals believe if they appease the beast, they'll be eaten last.
Actually the reason the Left in the US supported the war against the Nazis and the Japanese is because Germany and Japan had attacked the USSR.
The USSR was the mother of the USs Communist Party which had heavily infiltrated the Roosevelt administration.
For Communism to succeed in the US it was believed that the USSR must succeed. And the US Communist party was essentially fully directed from the USSR. Those that failed to follow directions from mother Russia were either called back to Russia and disposed of quietly or those that tried to escaped were hunted down and killed in the US.
The Democrat Party has been Communist Lite since 1931.