Disease is the screw up of ease.
Not to dispute your main point, but...
Those who survived were emotionally and financially destroyed.
He did make a technical error there. In 14th Century Europe, most farms were very small, family farms. The plague not only killed off many older people who had wealth, but that wealth went to younger people. Farms were consolidated, and produced crops in enough abundance to sell at the market, but this also meant a need for more labor.
Added up, younger people looking to use their inherited money, more efficient farms, greater employment, more food in the markets. And this even resulted in the wealthy having so much wealth that they began to fund artists and scholars.
So what followed the 14th Century plague? The Renaissance of the 15th-17th Centuries. In all fairness, Europe had begun to exit the Dark Ages in the 12th Century, in large part because of the Crusades. But the plague pushed it into overdrive.
It should also be noted that the plague of the 17th Century, created a similar effect, propelling society into the Industrial Revolution.
OBotulism
Liberalism is the deadliest.
Socialism is a biological weapon of mass destruction invented by the British, however they destroyed themselves during testing.