It's one thing when a military has the capability.
It's a whole different story when we start thinking about the ramifications of a mentally-disturbed university PhD student potentially having the ability to create something that might kill millions if released.
Or a small group of Muslim students who suddenly decide to go jihadi.
Or they could fly planes into buildings and thereby goad our government into building a police state that deprives us of our rights.
Or they could place containers of nerve gas disguised as oxy-acetlyne tanks in the New York subway system and open them up during the morning rush hour.
Or they could burn billions of tons of coal and increase the temperature of the earth.
Or they could even flouridate our water supply and pollute our precious bodily fluids.
I grew up with the perpetual threat of a rain of Soviet thermonuclear weapons falling from the sky without warning. My brothers and I even guessed how many megatons they had targeted for our home city.
Concerned? Sure. This merits watching. But some boogeymen are real and some are made up. Either way, I was done with being scared a long time ago.