Yeah this crowding thing is quite interesting, and one can only wonder how it impacts people. I had noticed this phenomenon in animals myself when I was a kid because of a fish aquarium my mom had. When there were just a couple fish, they became very territorial, fought all the time to the point of death and fiercely guarded their areas. But when you put a lot of fish in, of the same exact kind, they behaved completely peacefully! Just swam next to each other like nothing's the matter. It was so strange that it stuck in my memory, even though all other details have vanished, like what type of fish they were.