This is not everyone. These people are great but rare.
If there was a world full of people like this, life would be different but it isn’t. Most people suck.
Now in a time when there was homogeneous society and there was about 150 people you interacted people could be kept a lot more in check. But today no way.
Just today for example I called some guy scum and threw a plastic bag in his face because he took his dog to the beach and wouldn’t pick up his shit. I highly doubt that guy would do 40 hours of work for someone else if he didn’t have to. I had actually talked to him before that and he seemed positively pleasant.
You’re assuming people have those things.
Some people genuinely do not care about anyone but the set and maybe their family. They aren’t going to put care and effort into the community.
Your stats are wrong. Its not about the amount of people that can fill a particular role. Its about the amount of people what would be willing to do that.
Just because what .1% of Germans are volunteer fighter fighters. That doesnt mean 80% of everything can be done by volunteers all it shows is less than 1% of the population will volunteer