Some are calling the "Liberalism" you mention "Cultural Marxism," in the sense that even though Marxism was not successful in keeping Communism viable for the West, its motivations and principles are still alive in the minds of intellectuals, philosophers and politicians who continue to long for the demise of political and social freedom, individual rights, capitalism and nationalism.
Here is one application of this type of thinking (or NON-thinking):
A reasonable mind would have considered that after 9/11, individuals should have all restrictions on their right to keep and bears arms reduced or eliminated in order for each and every citizen to be more effective in terroristic situations in which they might find themselves. Terrorists and other criminals do not observe laws restricting possession or use of firearms, however, so law-abiding people, who DO observe those laws, are at a great disadvantage. Politically Correct Cultural Marxism, however, sees in the increase of terrorism even greater need to restrict the rights of the law-abiding "to control terrorism." What gets controlled however, is not terrorists or criminals, but the ones most harmed by it. Idiotic? Stupid? Wrong? Evil?
When people cannot defend themselves the terrorists and the criminals take over. Even centuries of historical observation bear this out.
Interesting that places such as Culver City, Simi Valley and Chino Hills, California (all in the Greater L.A. area), which allow citizens to carry a concealed firearm, have relatively low crime rates, for obvious reasons.
Let reasonable minds be in charge of their own destinies, then, and to Hell with Political Correctness and Cultural Marxism!!!!