Female Instincts Undermine Civilization

The Black Pigeon video channel says:

8:55 No great civilization, unfortunately, whether we like it or not, has ever lasted after handing women full sexual autonomy. The civilizations that did dominate, well, they enforced strict patriarchy, arranged marriages, male authority, and restricted freedom. These weren't cruelties. They were engineered for societal survival, guaranteeing reproduction, unity, and strong lineages.

I guess we have more free speech now, and he was previously banned for saying things like this:

0:06 if women's sexual preferences are liberated and go unchecked they destroy civilizations. if women are allowed to choose harems. for if women are allowed a voice in matters that pertain to the safety of a nation then that nation will die inevitably

0:21 it's as simple as that once you realize this you understand the entire basis behind civilized society and if not you'll understand by the end of this video ...

14:46 this is why we've never seen a feminist civilization aside from very short spans at the end of great empires.

14:57 the signs of decline are already observable while many countries are sliding into social decline. the canary in the coal mine is the self-described humanitarian superpower that pursues a feminist foreign policy.

15:10 when looking at sweden it's one of the most gender equal countries on earth and while they've become the rape capital of europe they're flushing their culture and country down the toilet and pressing forward in their civilizational suicide at an ever accelerating pace.

15:26 the total and complete feminization of sweden and its men have allowed their women to invite their country's own destruction through the importation of millions of unassimilatable and aggressive people from completely alien cultures.

15:43 not only are they borrowing money to fund the colonization of their country but they are now even creating gender imbalances that will have severe and lasting repercussions on their society's future and they await their doom with smiles of tolerance and passivity calm as hindu cows

He cites some academic research to back up some of what he says.

I am sure he is over-simplifying the research, but what if he is right? What would we do about it?

Probably some people would say that our modern liberal principles of feminism, democracy, egalitarianism, etc. require us to just put our heads in the sand and accept the consequences.

We have had a lot of social changes in the last 50 years, and many of them seemed to be without anyone even considering the long-term consequences. For example, importing Somalians to Minnesota or legalizing same-sex marriages. And changes to family law regarding divorce, alimony, and child custody. Maybe some of these are related to declines in child fertility. I do not think that the lawmakers or judges even considered the consequences.