It’s pure Darwinism on steroids. When 80% of the male population is deemed subhuman and left to rot, the defective system inevitably collapses, as it is impossible for it to sustain itself and remain stable. No society can function when reproduction is gatekept by a small elite. Of course, one "solution" they may go for is importing immigrants, but this just kicks the can down the road and creates a shitload of other problems: cultural fragmentation, strained infrastructure, and increased competition in the dating and job markets, further worsening the already hopeless conditions for native men.