When “pacifists” oppose defensive measures their true sympathies are revealed. There were pacifist groups in the U.S. in the thirties that opposed America entering WWII. Then Hitler invaded Russia in 1941 and all of a sudden these groups were all about intervening against Germany, showing their alignment with Stalin. A member of one such organization went to the FBI and became a spy.
Many of the world peace/nuclear freeze groups that made lots of noise during the Cold War were revealed to have been KGB-funded front groups following the fall of the Soviet Union.