A group of brain cells begins to have emergent properties such as consciousness and intelligence. A group of human brains has similar emergent properties. An individual human mind wants this and that, but an entire human community will have completely different priorities.
I prefer to think of the human population on Earth as a single massive organism that spreads like the mycelia of a fungus. Individual cells have simple needs and goals, but the organism as a whole will do much more than just expand everywhere and extract nutrients.