The Romans are perfectly justified to he angry. The Germans attacked them in a war of aggression, caused untold damage in Bulgaria and Macedonia, the war was the cause of an economic collapse, and after a hard fought victory that cost million lives they got jack shit. They couldn't even make the Germans pay the financial costs of the war because the Germans were just as broke, can you imagine how frustrating that must have been to the average Roman?
India - that was just Ody and Iskandar doing their own thing, you can't exactly blame all Romans for that.
As for the Great Crime, it was entirely justified (From a 17th century point of view)
The average Roman ittl reminds me of 21st century Russian nationalists. Always focusing on the perceived crimes done to them to justify the evil they do to the rest of the world. It's perplexing this comes from a state at its apex.
I remember when Hungary engaged in a bog standard border conflict with Rome, which rome partially provoked, and the romans responded by systematically wiping their capital city off the map. Or when the romans were offered a peace treaty in which they were given everything they wanted, and said "no, I want to rape and pillage your land for a year first", then signed the same treaty a year later. And no, genocide is never "justified". What it all is- and this is what distinguishes them from normal 17th century cruelty- is pointless. They engage in cruelty for the sake of it.
Now obviously, evil states exist, and sometimes they get away with it, and the world moves on. Life isn't fair. But I hope that going forward this thread, and the narrative, can acknowledge that these actions are evil, and unjustified*. The atrocities committed by Niketas are still evil, but understandable. He was a compelling, but flawed, hero. But it seems the romans have taken it into their cultural DNA that they need to be as cruel as possible to others, and formed a proto-fascist state, which efficiently carries out genocide, to do so. It's been depressing on a reread- the glory and fun parts of the Laskarid-Komnenian times has evolved into something evil, and the world ITTL would probably have been better off if the Romans had been finished in the time of troubles.
*Obviously B444 has acknowledged these actions are evil, and I'm not trying to tie them into this as justifying genocide. I'm just expressing it has gotten tiresome seeing the endless "Romans blame their neighbors for imagined slights" plot, and then seeing it repeated unironically by posters in this thread as true.