She's not loyal to the protagonist. She's loyal to the 'Elven Cause' they are not necessarily the same thing. It's just that he is the current project of that cause. And what if it starts failing? Say, by Elis doing things that are not EXACTLY in Elven interests. Do you think she would just stay loyal to it then or start finding something new?
I completely agree with this paragraph.
But you're forgetting one thing: what you said here about Alaina can be applied to any other vassal. That's how power works: if you prioritize the interests of one vassal over another, then the likelihood that the offended party will later betray you increases.
Wait a minute...
So your solution for making peace and living with both Humans and Elves in peace, is to keep them in fear of each other and say that you're the only one stopping the other from doing something awful?...Sorry, but that doesn't sound like such a solid plan I must say.
Also, HUMAN SUPREMACY FTW!
Dude...
That's exactly how the nuclear deterrence doctrine works. It's like they literally already had a war, where BOTH sides deemed further losses unwarranted.
And let me remind you, there haven't been any open, large-scale military clashes between humans and elves for a long time.
And over time, they'll just come to terms with each other.
What kind of human supremacy do you have when you're half-elf?
You can't spread hatred towards elves when you're an elf. You're undermining your own authority.
Who do you see yourself as? Inquisitor of a human empire of 40,000? No, you're Uncle Ruckus.
How is it naive tho? It's quite clearly the path that's being set up on the "fix her" path on a white run. Elis is trying to heal her and let her know that she's his sister, he loves her and he won't kill her. You can see she even starts softening up when she hears it. And it's also not the most unfeasible option that she genuinely loves him already on the Green path, or at the very least will come to. So it's really not that naive to believe it's possible, when we have visual evidence of it.
As for her betraying her father. Idk how you can come to the conclusion that it's undeserved or unexpected for her to do.
ahahahaha
These are two paragraphs of bias and naivety.
You're literally writing that he will fix it with the power of "love"
You use love as an argument and you still claim that this is not naive)
You can see she even starts softening up when she hears it
This is not an argument. It is your value judgment, based on bias, naivety, and sympathy.
Too much vanilla from a man who wants to get rid of an entire race.
As for her betraying her father. Idk how you can come to the conclusion that it's undeserved or unexpected for her to do.
Betrayal is betrayal.
It doesn't matter how you justify it. Especially since she betrayed her family (or so she thought).
And here you're talking about trusting traitors.
By that damn 'Puppetmaster Alaina' herself. I think most people including myself, would want to kill their fathers if they thought that he murdered their mothers. You don't mess with someones mother man...
Excuse me, HOLY GUARDIAN MOTHER Alaina.
A beautiful elf, to whom the protagonist owes everything, his power, and even his birth.
And I ask you to note that this is not bias, not a subjective view. It's a fact.
The fact is that no one has brought as much benefit to the protagonist as Alaina.
And Cass is simply a traitor. Because she betrayed not just over family matters, but also out of imperialistic ambitions. She betrayed her family.
Besides, Cass is a fool, because Alaina is so cleverly tricking her. She conned her like a sucker.
Very true. But I hate elves, and I want to see how far the Dev is willing to let me go with this, and if he's going to let me kill them all or not. So I'm going to feed my paranoia for now, to allow me to justify doing that.

Apparently the game will have at least three endings.
Destroy the elves. Destroy the humans. Neutrality.
And why feed your paranoia? Just do what you like. Kill whoever you like.