I can't strongly disagree with you there anon. Globgor killed someone. He murdered him. They're going to need to do some serious explaining to make what he did remotely justified. And, pessimist that I am, I can't help but feel they won't deliver on that.
I mean, they COULD and if I were to make a guess into how they might do that I could segue into how I feel they might be able to do that.
(If I had to guess - I'd say that it was after they tried to kill or stop globgor from rescuing his daughter or taking her back from st. olga's. They'd have to try to use force to stop him, some kind of battle or fight would ensue to try and stop him. But there's been no such mention of such a fight or battle in either the book of spells OR the show. Unless of course that was the fight they mentioned of globgor slaughtering the spiderbite kingdom or whatever it was in the ep where the spiderbites visit eclipsa.)
The political stuff can be done right, but like you said, it's delivering very mixed messages. Especially with the first mewmans on mewni being told, specifically, by 'god' (glossaryck) to conquer the land with no memory of where they were from, believing that they weren't pilgrims but natives driving out the foreign hordes. You can't really blame either side at this point, but they're doing their damnedest to do just that.