It’s a bad movie that you might have seen before. It tends to show up whenever an advocate of voluntary cooperation explains how society could operate without state coercion. Right on cue, the zombies from “Night of the Living Statists” rear their heads and mindlessly intone, “But if there’s no government, who will build the roads?!”
The zombies can’t hear your response, so it’s useless to try to give them facts and explain how things could be done in a way that’s better for everyone if roads and other such things were provided as private services rather than as coercive government monopolies. For those who are open to the facts, though, is there any evidence that people can actually cooperate voluntarily for their own interests?
As a matter of fact, there’s quite a bit of evidence of that.

Shingle reminds me what it felt like for someone to believe in me
What should we do if social media make us lonely, cause depression?
We often act like madmen who’re eagerly bent on self-destruction
Attaining excellence may require some time in painful mediocrity
Financial crisis seems serious when it hits your own neighbors
If there’s something you must do, income and vocation might clash
Public discourse is distorted by constant outrage over anecdotes
Do we choose to be free people? Or will we live as slaves to mobs?
When strangers tell us things we want to hear, we want to believe