If everyone knew how to survive independently of everyone else, and could be easily spooked into trying to survive in small self-sufficient groups, they'd quickly find out that the carrying capacity of this planet, without the various systems civilization has put in place, is about a tenth of the current population. There just isn't enough room or resources for billions of free-range humans. Consequently, people are way better off trying to keep their civilizations functioning than fussing over how to outlive them.
Competition often works best in a broadly collaborative environment, else you have disparate groups wasting time and resources needlessly repeating, if not sabotaging, each other's work.
It's a critical outlet for dissenting ideas that may prove valid, but pure competition is self-defeating.
I consider freedom of movement an intrinsic right of mine as a self-willed being, but exposing other's to contageous pathogens I may carry in close-quarters aboard a flying tin-can....not so much.