Now to your main points and its a doosey

No they aren't interested in rebuilding nor should they since there is nothing to rebuild to not in the scale people are thinking. Big, diverse societies fail as soon as the boot get tired and has to be lifted from people's necks.

We Men of the West a fractious people and so long as we keep pushing for unity we'll fail

. To get past that we have to accept smaller, less connected societies, essentially the largest homogeneous polities possible each one strong enough to deter invasion and linked just enough to keep the next imperial boot from their own neck.

Not easy and while few men want to be a big fish is tiny pond, bigger ponds need more fish. The temptation to overextend is always there,

The real question no one asks is which "Western" civilization anyway? Roman? Greek? Medieval? Migration Era? Post Modern? They are not all the same.

The assumption that we have can a mutuality agreed upon healthy ideology that can be extended all through North America and Europe is folly anyway.

And I said healthy, we have the Cathedral pretty universally which is in my estimation 50% Left hand Path Judaeo-Christian 25% Marx and 25% Graft and it just doesn't work long term

. Assuming though we can unite people under "Christendom" or "Western Civ" is absurd. Even in the Middle Ages under the so-called Christendom, a mythical concept if I ever heard one we Westfolk gleefully slaughtered each other in droves.

We have to accept our own natures and find a way to work with them not against them.

Also re: crowding, despite what the money obsessed capitalists types think . the human race really is well past its carrying capacity , both technically (not enough resources) and social and is do for a die-back sooner than later.

The thing is there are so many people that of say 90% of the people in the world died , there would be plenty and we'd have a world population around the same as 1700 or so, Plenty for trade, teeming cities, philosophy art and culture

Its really not an issue of any concern.

The real concern should be kinship and preserving your clan, you volk and not preserving a doomed civilization anyway.

Also re: that doom. For the US it was baked in the cake at the time of the founding, we've spent our entire history trying to externalize costs, push the cost of free labor onto slaves , push the cost and effort of manufacturing and its pollution onto some other country etc etc. That cannot go on for obvious reasons.

So instead of trying to save a doomed society from its own costs save your own people, fellow Men of the West who are loyal to the same goals you are,

Maybe in time, some new unifying force will come by but if not, I remind people, though violent at times, the Migration Era which is what this will IMO resemble wasn't all that bad.