We seem to have a model. If you are a king and have an enemy to fight, you want high-T soldiers. If you don’t have an enemy to fight, they might turn their fighting energies inwards, they may try to topple you and usurp your throne or revolt and become independent, so you better suppress their masculinity.
Therefore, if Jack Donovan is stating there is something, someone emasculating modern men, one possible explanation is that the current rulers fear revolt, or fear usurpation, largely due to the lack of WW2-type large scale external threats.
And this is actually something a Moldbug type political analysis could be relevant to. Who are the modern rulers? Why do they fear revolt or usurpation? Why cannot they just engineer a sufficiently scary external threat? Of course, it would only be a suitable threat if it would be equally threatening to elites (so that they sound convincing in condemning it) and to the plebs (so that they actually rally behind the elites and don’t just go meh) ?
And the million dollar question is: why is it so that whatever threats, real or imaginary, scare modern elites, they don’t scare the plebs, and what scares the plebs, does not scare the elites? Do they have no existential interests in common?