A new virus tends to kill everything it touches. Think Ebola. Big news, hazmat suits, death everywhere.
If a new virus doesn’t kill everything then it probably isn’t a new virus, and it certainly isn’t news. Therefore for you to know about it, it has to kill everything, otherwise you’d never hear about it. The same way you don’t hear about the nuclear war that didn’t happen yesterday.
It’s a problem if a virus kills everything. I mean of course, for the virus.
For a virus to survive it has to hop around and reproduce by finding new victims. If it doesn’t, then it dies along with it’s host. So it can’t be too deadly because then it’ll never spread.
A virus has to find a sweet spot where it can come along for the ride and kill you but not before you help it find someone else to infect. Ideally, it should be so benign as to never kill you. That way it can infect everyone you meet. Yay!
So the virus starts off by being very deadly. Through mutation and evolutionary selection new strains will appear. Some will be even more deadly! And some won’t.
The ones that aren’t as deadly will spread more since they have more time to spread before killing you. Over time they get less and less deadly.
And thus we arrive at Herpes. We’ve lived with variations of Herpes for millions of years. Over a billion people have the nice version (cold sores). Two thirds of the world has had some kind of Herpes.
It starts off killing everyone and being very unpleasant. Imagine how much fun the not-nice version of Herpes would be for you, living in 1690 or whatever. Then over time it evolved in to something basically benign – cold sores.
Cold sores (Herpes Simplex) have no cure and no vaccine. You’re stuck with it. It’s kind of annoying, but it doesn’t kill you or render you permanently unattractive to the opposite sex.
And thus to government.
Governments used to basically kill everyone. Think kings and queens and Napoleon. Big wars, random reasons for those wars, lots of death. Let’s all build a bunch of ships and kill people.
Over time, government has figured out that if you keep killing everyone then it gets hard to have anyone left over to tax. This is just like a virus evolving to be benign.
Government evolved from arbitrary rulers and rules in to modern democracy. Government no longer kills everyone all the time, but just taxes people instead in a far more stable symbiotic relationship.
There are still random flare ups, just like Ebola: Occasionally governments (especially far away stupid governments) will randomly kill everyone like Venezuela or Syria in their own ways are doing today. But on average, they’ve evolved to exist with their citizens in benign partnership.
I’m not sure how much farther the analogy can be pushed, but it’s an entertaining thought experiment.