> Their primary purpose is to prevent lethal intergroup violence and blood feuds.
[citation needed]
Historically, at least initially, their primary purpose was to allow tribes to organize themselves in a way that would support labor-intensive farming practices. Large-scale early grain farming was not possible without an organized state.
As technological complexity grew, states grew as well. I’d argue that the closest thing to a primary “purpose” for states (not that there is one, states evolved organically) is to maintain the organization of industrial supply chains that perpetuate modern life. Defense is secondary; still important, but this comes after ensuring that resources are available to sustain life.
States are currently the primary perpetuators of violence, and they are presently faltering at their job of maintaining global resource flows, thanks to all the violence. If they fail completely, we all lose.
Humorous rejoinder to complain of my own lack of citation and then responding with an ostensibly competing theory while offering no citation of your own.
Perhaps it is because you are aware that the two go hand in hand?
As to the rest of it, it sort of fails the historical test on its face. States have been around since well before Christ. Your disappointment with contemporary geopolitics ("all the violence"), economics ("industrial supply chains ") or whatever other ills you discover in your "modern life" are irrelevant to the question of state formation. Your contention of states creating more violence has also been debunked. Obviously there is more violence with more people. People are violent. On a per capita basis, states reduce violence. There is a rather well known book on this that was somewhat recently published that I strongly suspect you are aware of.
I sympathize with your disappointment. Do try to cheer up. The easiest way is to realize that despite everything, there are few eras where you would actually prefer to live instead. Certainly if you had no control over your social class, precise geographical location, or had up to give or take 100 years of variance baked into your somewhat errant time machine.
If you ran the same algorithm on the present age you would have a better shot at a pleasurable life than most humans could have ever dreamed for most of human history. If you require a citation for this we should probably just agree to disagree. Have a nice day.