there's not going to be some "post apocalyptic mad max world" if shit collapses. plus if shit "hits the fan", that doesn't mean every single country in the world simultaneously erupts into wide-spread revolts and every single currency destabilizes simultaneously. this is bordering on "investing in anything that you can't eat, build with, or shoot with is always inherently dumb without question". might as well scream at everyone going for stocks, bitcoin, and pokemon cards in that same breath.
United States