If anarchy works, why does every sport require umpires, referees, and line judges?
Now, I know a friendly game between pals doesn’t “require” an impartial authority for settling dusputes, but disputes occur even between the most amiable opponents. “Do-overs” don’t work with real life problems, either. Sure, the umpires and refs make mistakes, but there is greater success in settling disputes accurately (and peacefully) with them than without them.
If anarchy works, why hasn’t a country started a war that no one showed up to fight?
This seems the most damning. If every human being was a self-sufficient, independent-thinking individual, why are we so easily led? Why would people go out and die for the wishes of the wealthy? Because they were tricked, or guilted, or made to feel it was honorable? I suspect one may imagine it might be coercion, but government has no monopoly on threatening people to do something… or else.