This thread is hilarious. Do what you want, but to rm -rf (assume /) to get rid of unwanted packages is the most Windows thing.
No matter your package manager, I am sure there is a way to get a list of explicitly installed packages and then going through it and uninstalling with the package manager automatically removing it’s dependencies seems like a way faster method.
I don’t buy it. Large scale ecological collapse and the following mega migrations, is going to butt fuck the fuck out of industrialised countries way before a wealthy Nigerian can luxury shop for migration destinations.
Also most industrialised countries would mostly need skilled labour and not random untrained immigrants, which of course would be the majority by far of future migrations.