While in all fairness, that penalty should never have been called for the Italians (against Australia), Lucas Neill brought it on himself. There was no need for him to go down and give the Italian something to fall over.
Good luck trying to find a patch of grass that big in the inner city!
No need. The roots of football/soccer are poor kids in semi-squalid urban areas kicking a ball (or a round bundle of rags, if necessary) around between warehouses and factories and such.
That's why South America turns out so many technically gifted players- if you can dribble around defenders AND broken bottles and scrap metal, it only gets easier once you're on a big open field of smooth grass.
It's like how distance runners train at altitude. When your body adapts to the thin air in the mountains, your lungs can extract that much more oxygen from the rich air at sea level.