> Why? Is it someone else's land that you're trespassing on, using up their resources, hunting their animals, etc?
Yeah. Just about every bit of land is owned by someone. In order to have my own land to live off of I need to produce some income to pay property taxes, lest the state confiscate it from me.
And it's not a question of 1% owning "too much", either. A hunter-gatherer life is hideously inefficient. There isn't enough land on Earth to support even a small fraction of the population living this way.