> Ebola, HIV, the flu de jour all quite terrifying, all 100% natural.

If you can't imagine anything more terrifying than those, it is a failure of imagination. See Jared Diamond's point about how when humans and large animals coevolved gradually in Africa, the animals could gradually adapt, whereas when fully evolved homo sapiens were introduced in the rest of the world 40,000 years ago, almost all the megafauna were killed off almost immediately.

> They will keep evolving and trying to kill you as fast and as hard as they can,

Thankfully, this is wrong. Diseases that kill you quickly are at a severe disadvantage.