If Private Sam decides to use prisoners of war to clear a minefield, and someone suggests that he's committed a warcrime, he can point to the superiors who gave him the order. Who can point to the superiors who gave them an order. Who can ultimately point to the government that either gave them an order or knew about the policy and permitted them to continue. Any prosecution of Private Sam would also open his superiors to prosecution because of command responsibility.
So, uh, Private Sam isn't getting prosecuted. You can say that's cynical, if you like. I would describe it more as "pattern recognition". The top military and civilian leadership of a nation is usually not keen on going to court, and possibly to jail, so they'll use their power to prevent that from happening.
One of the things that has been mentioned on the Discord is that a fair chunk of Director Granger's time, and to some degree Hackett's as well, has been beating the "warcrimes friendly" personnel out of the GDI hierarchy. While there are still soldiers and agents who would commit warcrimes, the institutional structure to support/permit them doing so has been much lessened. And in an American-influenced military, *following* an order to commit a warcrime is itself a crime. Not that it necessarily gets prosecuted, but that's a failure of enforcement.
Granted, the ability of Director Granger to reform GDI (with the help of various subordinates like Doctor Granger) was in large part due to the nuking of Philadelphia station at the start of TibWar 3, which removed much of the existing hierarchy that kept the previous system in place. It is suspected that Kane is still smirking about this outcome.
OK that's the Cypherpunk English Coding Circles. They are older and more active than the Writing Circles. I got introduced to the Cypherpunk Writing trough
Dex. If you've ever played an RPG you'll break the gameplay over your knee, but it's story is basically a cypherpunk retelling of Neuromancer.

Welp the studio for the game is Czech. It would seem that @Simon_Jester is right about me once again. Cypherpunk writing is only a thing in Slavic English slang. Sigh. Is this the only English English forum I visit? Considering that my favorite RTS is Earth 2150 that is entirely possible.
Sorry about me dragging in concepts badly again people.
A couple things: first, while you described your image of a panopticon society (which does not match GDI, and probably only marginally describes NOD), you didn't actually what form the implosion would take. Just that it could happen by overcoming said social isolation and pressure. Which I think is where the confusion started, since it's not an English/American concept.
Second, as mentioned, GDI does not run on a system similar to your description of a Panopticon. It is a surveillance state, in that there is pervasive counterintelligence action throughout society, but that does not cause social isolation, and minimal social pressure. NOD may or may not be closer, we don't really know, partly because it's a highly variable society. But they certainly don't use AIs - the one AI known to be active is LEGION, which is likely currently busy helping Kane with the Tacitus.
Also, one of the general issues with NOD is that after each period of inactivity, Kane usually has to re-establish his control and rule over the various factions of NOD. The Brotherhood is quite capable of operating without him, although in a less focused/efficient manner.
For the firestorm System, in Canon it does still exist but has become increasing expensive and was generally not deployed for the entirety of the Third Tiberium War. We do see one in canon where Legion is assaulting the Lab containing the Tacitus. He had to disable generators if I remember correctly and that the system had changed drastically into being more of a bubble shield which you could not get through until the generators were destroyed or disabled. Making it seem to be only used due to staggering important of securing of the facility.
One thing of note is that the Shimmer Shield tech is probably going to synergize with Firestorm Shields by providing "edges" for it, or covering the areas it doesn't. (Such as "up".)