They’re not all actually decreasing in population, they are increasing via mass migration, legal and illegal. That is how the elite strata of Western European societies and the Anglo sphere countries (US, Canada, Australia) are dealing with this.

In Japan, Korea, China, Hungary, etc they are indeed decreasing.

I wouldn’t necessarily say that a society where the marriage rates are so low is stable though. For some definition of stability yes, but usually we also mean healthy when we say stable.

Well we’ve already established that the use of the term genocide is nonsense, I’m arguing something different. In this case that the type of defective thinking displayed in the idea you need to be a member of some institution to apply your intellect is in part responsible for the fact every other developed society is dying, it has to do with agency and libido (the psychological sense of the term).