I thought the same when I lived in the burbs. Until, dog poop got tracked into our house a couple of times.
I knew who the culprit was. One Saturday our house was wrapped and I was standing at the window and noticed
her outside with her little yappy dogs and she let them poop in the yard and started walking off. I politely
asked her if she would pick it up. She said she didn't need to. I proceeded to tell her I have a big German
Shepard in the back and I would gladly walk him down later and let him poop on her door step. She reached
up and grabbed some TP from the tree and picked it up. I never had a problem again. Of course, I moved to the country.