Charles Murray described this all in 2012 in his book “Coming Apart.”
One of his basic themes is that virtue-signaling leftist-leaning upper class elites generally do NOT live by the value they espouse - they stay married and monogamous, they don’t do habitually do drugs and they emphasize education - and pass these behaviors on to their kids, which is why they stay in the upper class.
The post-modern leftist values of abortion, single-motherhood, divorce, drug-use, mass public education rather are for the lower classes, who are then decimated by them
The “post modern leftist” likes its Plantation Workers