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.

Can I talk myself into not wanting great things I fear I’ll never have?
Feral cats and hurt people both require trust and patience to heal
I don’t like to admit this, but recent changes leave me afraid
Maybe it’s so hard to love others because we don’t love ourselves
Black ex-congressman speaks truth about racial ‘groupthink’ on voter ID
I want to help out of pure love, but human motives are messy
Happiness and success elude me unless I’m doing something I love