Every pandemic is different. There is a potential for a simple fungus to wipe out vast populations, especially in climate change. In life who is the hunted and who is the prey change places quickly. C'est la guerre.
Right now our cleverness has an advantage over stupidity. It may not always be the case. Sometimes we are just lucky, sometimes luck runs out.

For those who asked what if we weaponized the common cold, they have their answer. We need better questions don't you think.