The evolutionary strategy of the cuckoo is well known. It led to the traditional term for a man cheated upon: cuckold. Which led to the sexual kink of a man who enjoys watching his wife being fucked by another man, also known as a cuckold.
More interestingly, the metaphor was then stretched along civilizational lines, into the politics of race, subsidy and much more, all focused on a new term of abuse: cuck. This is the alt-right contribution to modern debate and invective.
There is something to it.
But the alt-right trolls and lolsters were not the first to expand upon the paradigmatic bird, the cuckoo. There was John Wyndham and his science fiction masterpiece, The Midwich Cuckoos, filmed as The Village of the Damned — a great little film, that.
Thus I justify the following visual “meme”: