These are what we call the 'YMMV items.' Things that some people find in this work. We call them 'your mileage might vary' because not everyone sees these things in the same way. This starts discussions in the trope lists, a thing we don't want. Please use the discussion page if you'd like to discuss any of these items.
Alternate Character Interpretation: In the 2014 movie, following popular Fanon. In the book, Kira's death was (probably) an accident during botched kidnapping by Don Reba's men. In the movie, the death was an assassination by Arata in order to sick Rumata at Don Reba's soldiers. It worked a little bit too well—Rumata slaughtered a whole bunch of soldiers and courtiers, and also Arata himself. Although who knows—Arata might consider his own life a reasonable price for overthrowing Reba.
Complete Monster: Don Reba is a thoroughly despicable Smug Snake of a minister, who personifies everything wrong about humanity. He framed the former Prime Minister for treachery and tortured him to death, along with the whole cabinet; he declares everybody literate (and not noble) enemy of the state; he starts wars for petty revenge; he stages a Coup d'Etat, and when it succeeds, he kills his co-conspirators; finally, he tries to kidnap The Hero's Love Interest, which backfires horribly, leading to the Downer Ending.
Fanon: A popular fan theory about the ending states that Reba had nothing to gain from tangling with Rumata once again. On the other hand, there was a certain Rebel Leader well known for being willing to do whatever has to be done to turn this Crapsack World slightly less crappy. He did state that Rumata would have to take a stance for him or against him, after all.