but if you ever want some cheap entertainment, ask a pure Libertarian at a party how things like SARS and the recent monkey pox outbreak in the US would be handled in their perfectly Rand world.

That one is easy. In a Libertarian World, all taxes really are voluntary, so no one pays any. As a result, there are no roads. So when anyone gets ill with SARS or monkeypox, they die without any adequate medical attention because it's 5 days to the nearest hospital. Not that it really matters - since no one paid the taxes, there aren't any teachers. So that also means that no one graduated high school, or got into college. Or med. school. So there aren't any doctors anyway. Since this all means that no one ever gets diagnosed with any of these new-fangled diseases, they obviously don't exist.

Problem solved.