Good observation: Politically Correct Progressives lie. ("Liberals" are NOT liberal--they are PC-Progressives.)
However, we must understand where this wholly non-traditional-American attitude and belief system came from. Only then can we actually understand our opponents so that we can defeat them.
PC-Progressives' belief system ("America is a racist, sexist, foreigner-hating, imperialist, capitalist hell-hole that must be changed.") is not American. It was deliberately introduced into our culture by communist espionage operators. Their plan was to destroy our unique culture.
The operation and its operators are all detailed in my book: Willing Accomplices: How KGB covert inlfuence agents created Political Correctness.