Maybe it was both? The Foundation series by Asimov talk about the Foundation, that aimed to hasten and then control a still inevitable collapse, and ensure its

Maybe it was both? The Foundation series by Asimov talk about the Foundation, that aimed to hasten and then control a still inevitable collapse, and ensure itself would be the replacement culture. Al Qaeda, that can mean "The Foundation" in Arabic, is speculated to have this aim too, using immigration, intermarriage, and dragging western civilization in a extended unpayable war with the same idea: hasten the inevitable collapse, and be ready to rebuild and replace from the ashes. (And ISIS is an impatient Al Qaeda, and wants to trigger a total war, to overextend western countries even faster, and cause a refugee-driven diaspora)