
Originally Posted by
Vyrerus
Unfortunately, it's not textbook Fascism. It's a little more tribal than that, imo. While he does place a great deal of importance on strength, he also yields to higher strength. This is shown both by his loyalty to the Emperor and by his acquiescence to the WoL(in later patches). But it's also shown in his speech, where he asserts that you're welcome to stop him, if you can.
Textbook Fascism is dictatorship, enforced through violent means if necessary, where the dictator won't even conscience opposition or shared leadership. Kind of makes sense, coming from someone raised in an empire. Fascists want authority, and that's pretty much it. They'll sacrifice their people, their family, their good image, and basically anything to gain and keep authority. Gaius on the other hand is advocating for a kratocracy. A type of rule where might makes right, because they mighty are those who can solve problems and keep the populace safe. He offers you regency of Eorzea before the first boss in Prae, if you side with him.
Essentially, he's a master moralist and a universalist like Immanuel Kant. It's made evident by him wanting you to take up his view, and by him noting that he would be perfectly fine with someone else stronger than him ruling. To him, might is right, is a categorical imperative. So while it does share some qualities of fascism, such as authoritarianism, it's not fascism.
As for Gaius's motivations for Ascian killing and the options open to him... Well, his option, singular, at the time was convince this Elezen BLM to not kill him. As we have been told so far. I wouldn't expect Gaius to have changed dramatically fresh out of his ass whooping. He kept to his convictions even in defeat.
As for Livia being a plot hole. Nah, it's not a plot hole at all. The more pressing matter at hand was that we were penetrating deep into the Castrum, and we needed to be stopped. While I can admit that it's weird that there was nary a mention at all, ever since, and certainly no mourning, we can take that as Gaius wanting to exude strength in his speech about how strength is all that matters. He's trying to lull us over to his line of thinking to ally with him, and he certainly did make a good point about how we're the ones with actual power at our fingertips, rather than the city-state leaders. Had he mentioned Livia or cursed us for killing her, it'd betray emotion and weaken his position.