There aren't "tens of trillions of dollars" people can spend on healthcare. Making everyone sick collapses the economy, and these companies would be negatively impacted by it.

Face masks are running out in many countries, not just the US. This isn't really a product of the atrocious healthcare system the US has, it's just a product of not being well-prepared for disaster scenarios.

Think about how most companies don't check whether their backups work. Now, replace "working backups" with "stocked-up pandemic supplies".