@purplelibraryguy
It's been 5 months, I'll have to re-read the last few chapters to remember everything, and I haven't yet read the next chapter. So please correct me if I'm mistaken in anything.
For the most part I agree with you, if Eugene really did betray everybody, it'd be hard to imagine any circumstances that would justify his actions. That said, we don't even know if Eugene actually did any of those things you mentioned below. I was saying we should wait to see Eugene's reasons before we judge his actions, because we don't even know for sure yet what he was doing or why. For all we know, Eugene could have, perhaps misguidedly, been trying to save everybody. All we have are some fragmented memories that only show events from the Princess' perspective, plus all the nationalist hatred from the side characters. From what I remember all we know for sure is:
Eugene probably wasn't aware of the invasion before it happened.
Eugene was the type of person who kept his thoughts/feelings/intentions to himself and didn't share much with the Princess or his subordinates.
Eugene was up to something at the end, which was implied to be nefarious, but that view comes from biased observers whose own memories are still confused, especially as to what happened at the end.
Zeze doesn't yet remember all the events from Eugene's perspective.