You just don't get the monopsonistic buyer free loader syndrome do you? Do you really think drug companies price discriminating against American drug consumers and taxpayers is something that should be tolerated?
They are not doing so because they want to. This oligopoly would love to charge a higher price in other markets, but the governments there have formally and informally instituted price controls.
A Machiavellian would love your strategy as it would end the price controls in other countries--drug co. would sell only here if the price controls didn't budge in an upward direction.
I completely understand the freeloader aspect of what's going on. Drug co. should refuse to sell in those countries, but I reject intereference with their selection of price here.