Considering food is a national security item, the threshold must be higher.

One store loosing its frozen food is an inconvenience and insurance claim, and one electric substation failing is an inconvenience for a few days.

But whenever any one of these attacks could be scaled up, as is obviously possible with online access enabled, and the consequences become a regionally or national security threat, enabling such access must come with the seriousness of implementing national security.

Unfortunately, it is not sexy for politicians to take national security seriously, and they will get inundated with lobbying decrying the costs. Until the losses to the companies exceed the costs of security, when they come screaming to the govt for help, and demanding why they didn't do something.