^Division between nobles and commoners was very common in Britain at certain points and probably throughout Europe. So I found that FFT dealt with the issue very realistically.

I think Matsuno was very inspired by Europe. The writing style used in translation of the PSP version is very Shakespearean and the domination of the Catholic Church is very reminiscent of times of old. Who can forget the terrible sins they commited? (and still commit to this day unfortunately)

I don't think it's fair to compare Delita to Stalin. Delita only murdered a few people, for specific reasons, for what could have been seen as the greater good. Stalin purges killed millions of lives for no reason at all. But yeah, the victors do write the history books.

The victor writes the history books. Just because Delita likely executed any historians who would dare to write anything that besmirched his name doesn't mean that the atrocities weren't there.
What specific events would you describe as atrocities? My memory is a lil rusty.