Big cities are anonymous places. You can be as rude as you like to strangers in New York, Paris or London and run only a minuscule risk of meeting the same people again (especially if you are in a car).
We are far more dependent on other members of our species than any other ape or monkey. We are more like ants or termites who live as slaves to their societies.
The higher the leverage point, the more the system will resist changing it – that’s why societies often rub out truly enlightened beings.