Your comparison makes no sense. A person is banned from driving drunk because it can result in people getting killed.
There is nothing preventing 15-minute cities from having both pedestrian walkways as well as roads.. as most cities ALREADY do.
And oh, by the way, even a 15-minute city will have to make space for roads for vehicles. When you change houses, you aren't carrying your furniture on foot between houses, are you? or for that matter, when you call emergency (911), the cops and emergency workers are not arriving by foot. Or when you make a house, the construction equipment, material etc are not being carried in by foot either. Also, the shops in your neighbourhood are not been replenished by suppliers carrying in products on their back.
So this idea that you can suddenly replace all roads with pedestrian paths is just completely unworkable.
Please find one example of roads being replaced by pedestrian paths? LTNs put a block at one point in the road, so people who live there can drive from whichever side of the block they live on if they're moving house (or even if they want to use their car for any reason!) They're Low Traffic Neighbourhoods, not Zero traffic.
The block is to prevent people using the small residential street as a through-path for motorists from other areas, not to prevent any vehicle from ever using the roads.
There is nothing preventing 15-minute cities from having both pedestrian walkways as well as roads.. as most cities ALREADY do.
And oh, by the way, even a 15-minute city will have to make space for roads for vehicles. When you change houses, you aren't carrying your furniture on foot between houses, are you? or for that matter, when you call emergency (911), the cops and emergency workers are not arriving by foot. Or when you make a house, the construction equipment, material etc are not being carried in by foot either. Also, the shops in your neighbourhood are not been replenished by suppliers carrying in products on their back.
So this idea that you can suddenly replace all roads with pedestrian paths is just completely unworkable.