1. When everybody is walking outside, instead of transiting through cars, it is a lot harder for pedestrians to be robbed. Also, police actually start caring more about pedestrian safety when so many people are walking. Walkable neighbourhoods can be a lot safer than the safest car-friendly neighbourhoods, with the right system.

2. As for carrying, based on my experience of living in a walkable neighbourhood where thousands of people lived within a kilometer of the central shopping area, a lot of people would bring carts that they would push their groceries home in. If you can push a small wheeled grocery cart through the total 100 meter aisles of the grocery store, then you can push a big wheeled cart the 1000 meter to your house on the sidewalk. Given that I often saw 80 year olds doing that, most healthy people should also be able to do it, no problem.

Many things could also be delivered with cargo bikes for the last mile with trucks only delivering to neighborhood depots.

So you will consume less to? Another bonus.