The key is in the word "nature", lots of people enjoy being in more or less wild nature. And camping, wild camping in American, is about self-sufficiency and simplicity. You only use what you carry on your back, and you don't bring more than you absolutely need.

I'm not saying you shouldn't put your tent on a crowded lawn, or next to your car, if that's you want to, but it obviously doesn't serve the same purpose as hiking up the mountains and putting your tent next to a brook, miles away from anyone else.