I honestly wish people would quit thinking this is some issue or big deal, like Elon or any prominent right wing host. Mass immigration is bad yes, and it is the sole reason for the decreasing white portion of countries. You cant expect whites to just outbreed all the browns because we are more K-selected other than maybe the east asians. Birth rates also dont just stay one way either, it's basic evolution. As for social security, worse case scenario it just becomes funded like another welfare system instead of pension system, ie medicare just becomes like medicaid, stop pretending it will somehow destroy civilization. If anything maybe it will make our countries more free market when it runs out, but most likely like i said it will just be funded like any of the other welfare systems we have, IE just income taxes not a separate social security fund.