Tell me again why the systems running critical infrastructure are connected to the internet in the first place? They should be air-gapped.
They aren’t connected to the internet, or they arent supposed to be, I cant answer for everything and everyone in the US.
Systems running critical infrastructure are air-gapped. And protected beyond this, which I cant go into details about. But this is old news.
There are ways around this, look up Stuxnet (really, do look it up, its a fascinating story). This is a game thats been going on in re air-gapped systems for a long time.
One of the reasons is that during the COVID affair, everyone wanted to (or was told to) stay home and use the internet to communicate and access computer systems at work.