I learned a new word a couple of months ago, coming across it believe it or not in a Wikipedia article, in a section on the early life of Julian Assange: agitprop. Your vocabulary level is lofty so I don't assume your not knowing it, but as a summary for anyone else, it's basically the long-known practice of insertion of communist values and messages and urgings (ergo "propaganda" and "agitation") into art and entertainment and other things.
This so-called intellectual dead headism will never "have gone on" (until all of this world has passed away), because it's what can more aptly be described, vice upside-down pentagrams and whatnot, as Satanism; that is, the infliction of misery on man and the spiritually-driven compulsion to do so. Anti-wisdom, if you will (which to me is also what sin is).
With the exception of a few highly notable social issues, public policy does not have a large overlap with morality, strictly speaking, for the Right for the most part. But for those who don't believe in the existence of either the master we serve or the one they do, politics and morality and one in the same. Leftism is a major world religion with billions of followers, and will not die out any more than the others will. (In fact, it has the advantage, by dispensing with traditional trappings like showing up mostly on Sunday mornings and sitting in long wooden benches, of giving the appearance of being the most "modern".)
And even if the white Liberal establishment that now p0wns most of this country's major institutions were to eventually die out, they are replenishing the country with idealogical heirs from Central and South America, who, like the Black community in this country, have fallen for, for generations and generations, the promises of a better life from free stuff with Leftism.