Should the cyber defense of critical infrastructure be exempted from the posse comitatus act?

If you carve out exemptions in the Posse Comitatus (and parallel regulations in other services) to use the Military (et al) on US Soil, it defeats the purpose of the PSA. It's putting the proverbial "Camel's nose in the tent."

We have a latticework of electrical & water systems. Knock over a fire-hydrant and the Army is after you instead of the local cops. Police & Courts. They are already LEOs... why would they need additional help from the military "above and beyond" the NG (which is already exempt from the PSA)?

See how quickly we can get into this rabbit-hole? Many things are already considered "Federal" crimes. Being able to use Military as Police on the Citizenry is just a bad deal.

This is an interesting question. It would be fair to view the cybersphere similar to the atmosphere. It can't be divided into neat parcels like the geosphere (national boundaries) or cordoned off like the hydosphere (three mile limits, etc) It transcends such limiting concepts. Tasking separate agencies to defend each section would be impossible because it simply can't be "sectioned". And, even if you could, threats could traverse sections multiple times at lightning speeds thus confounding attempts to coordinate defenses. Of course, the question could be sidestepped by simply assigning defense of America's vital interests in the cybersphere to a "civilian" agency.

We need new Joint doctrine, technology, or TTPs or we will end up like France, which was unprepared for mobile warfare. It makes no sense exposing Americans' innocence to terrorist plots that we can flush out. How many must die before we realize that a defensive posture is not good enough?