There was a time when liberalism was identified with anti-Communism. But the Vietnam War led liberals into the arms of the Left, which had been morally confused about Communism since its inception and had become essentially pacifist following the carnage of World War I.That can't be right. The Left was essentially pacifist after WWI if you don't count the Spanish Civil War and support for WWII. It is also possible to argue that arguing against interventions in Korea, Vietnam, Central America, South America, Iran, etc isn't pacifism but rather sane foreign policy.
He goes on to show that Liberals or Leftists, which are the same thing even if they disagree about everything, now fail to refudiate terrorism because of their hideous moral relativism. Leaving aside all those Liberals who have done just that, he's right as rain.
Prager concludes by excusing Dr. Laura, after the ad, and noting "[t]hose who don’t fight real evils fight imaginary ones." He lacks, it seems to me, self-awareness.