And plagues are good for society. The old and weak are killed (byebye Florida), there is a distribution of power, and more resources are freed up for everyone. A plague could help stop global warming, drop oil prices, and, in the long run, help the global economy.

Not to say it would be GOOD, but either disease or widespread birth control are the only ways to save society.


Edit: I wouldn't be too sure about vaccination, either. Sure, in developed countries, but poorer ones won't be able to afford huge amounts of it.