I like Amazon's service. Parking at Costco on a Saturday is absurd to the point there's memes about it. I really hate standing in lines. Delivery to my door is awesome and I'm willing to pay extra for it. I also see the Amazon truck going house-to-house and don't feel guilty: I'm just one more stop along the way, my marginal impact is nothing at this point.
Your last sentence is literally the tragedy of the commons.