One can't help but wonder how alone Urza Jaddo was in his Narn sympathies, one would assume there must be factions of Centauri who outright opposed the war.
I think there were; my headcanon, which I believe I used for some stories like "Lost in Translation", is that Turhan as a younger man became the focus point of the peace party, much as Cartagia a generation (or two!) later became the "candidate", so to speak, of the war party. That's assuming that the Centauri occupation of Narn went on for a century or so, and by the end there must have been anti war attitude both for utterly pragmatic reasons (Narn was costing far more than it was bringing in, in terms of money and manpower) and for moral reasons (note that Urza was a former war hero, btw). So Turhan, backed up by a sizaable contingent in the Centaurum, orders the first withdrawal from Narn. (This is also why House Mollari loses seriously in influence, because Londo's grandfather was a hardcore Narn occupier and warmongerer.) But then as the Narn turn into an up and coming power and start to not just to compete with but to best the Centauri, you get the "we could have kept that planet if only those peaceniks hadn't stabbed us in the back, and look how humiliated we are now!" propaganda starting, and by the end of Turhan's reign, Turhan and Malachi and their reconciliation policy are very much a minority opinion, and they're seen as failures.
re: your question how Cartagia's regime would have been seen - I'm tempted to go with the Caligula and Nero receptions, of course, i.e. people would assume Cartagia got off to a great start and renewal after his uncle's age of decline, and then went bonkers. (If they're rumours about Cartagia's craziness at the Royal Court, they must have been among the population as well. Plus the Shadows openly arrived on Centauri Prime, and I can't imagine any Centauri glad about having those creepy ships around. If humans went crazy touching them, it must have happened to Centauri as well. I'M taking Londo at his word that the people remaining on Celini to trick the Shadows volunteered, and for this to happen, my guess is at that point the general opinion, carefully expressed only in private, was "the Emperor went mad, these creepy aliens probably had something to do with it, have you heard what happened to cousin X who, etc., and by the way, my uncle says critisizing the Emperor's hair cut is now punishable by death".
no subject
I think there were; my headcanon, which I believe I used for some stories like "Lost in Translation", is that Turhan as a younger man became the focus point of the peace party, much as Cartagia a generation (or two!) later became the "candidate", so to speak, of the war party. That's assuming that the Centauri occupation of Narn went on for a century or so, and by the end there must have been anti war attitude both for utterly pragmatic reasons (Narn was costing far more than it was bringing in, in terms of money and manpower) and for moral reasons (note that Urza was a former war hero, btw). So Turhan, backed up by a sizaable contingent in the Centaurum, orders the first withdrawal from Narn. (This is also why House Mollari loses seriously in influence, because Londo's grandfather was a hardcore Narn occupier and warmongerer.) But then as the Narn turn into an up and coming power and start to not just to compete with but to best the Centauri, you get the "we could have kept that planet if only those peaceniks hadn't stabbed us in the back, and look how humiliated we are now!" propaganda starting, and by the end of Turhan's reign, Turhan and Malachi and their reconciliation policy are very much a minority opinion, and they're seen as failures.
re: your question how Cartagia's regime would have been seen - I'm tempted to go with the Caligula and Nero receptions, of course, i.e. people would assume Cartagia got off to a great start and renewal after his uncle's age of decline, and then went bonkers. (If they're rumours about Cartagia's craziness at the Royal Court, they must have been among the population as well. Plus the Shadows openly arrived on Centauri Prime, and I can't imagine any Centauri glad about having those creepy ships around. If humans went crazy touching them, it must have happened to Centauri as well. I'M taking Londo at his word that the people remaining on Celini to trick the Shadows volunteered, and for this to happen, my guess is at that point the general opinion, carefully expressed only in private, was "the Emperor went mad, these creepy aliens probably had something to do with it, have you heard what happened to cousin X who, etc., and by the way, my uncle says critisizing the Emperor's hair cut is now punishable by death".