At least in the cities I've lived in, there tends to be a lot of internetworking in the local hospitals. If my local hospital, CRMC, were to be hit by ransomware or otherwise taken down it's likely that a good chunk of the city's health infra would be out or at least at risk too. Not to mention the damage an attacker could do to the data stored in an EHR system like Epic.

My point (which wasn't well made, admittedly) is that a closed hospital has immediate and material effects. Disrupted petroleum infrastructure isn't going to affect consumers for days.

What if you attack the hospital in the middle of, lets say a covid outbreak, where no excess capacity is available. Now you've likely caused a significant number of deaths.