If you're reading this, you're probably WEIRD. That is, you probably live in a society that's Western, Educated, Industrialized, Rich, and Democratic. People from WEIRD cultures think and perceive the world very differently from everyone else.
Certainly, non-natives do have their place (e.g., vegetable gardens, turfgrass for recreation, and exotic flowers for show), but the dominance of exotic vegetation is at the expense of our natural heritage. Alternatives do exist and people are increasingly interested in sustainable options.