Ah yeah, that makes sense. However, if all roads are fully jammed, most people would be able to walk to a grocery store - it’s likely not insanely far away from you (quick search suggests average straight-line distance to a grocery shop in the US is ~4 km = 50 min, which sounds very far away from a non-US perspective but still not completely unreachable), it’s just that usually there’s a highway full of traffic between you and the store.
You are overestimating the danger of a punctured tire. It is easy to notice, usually gives you plenty of time (on the order of minutes) to come to a complete stop before the tire is deflated, and even after the tire is fully deflated it still allows you to stop relatively safely for a short while (until it is cut through completely). It would probably result in a few crashes (because in carbrained places many drivers don’t know how to operate a vehicle at all), but the worst outcome from this is ambulances/firetrucks being stuck in traffic jams.
Scatter random tire spikes on the roads. 10k would probably get you quite a few
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