So Thana Vesh is a completely incompetent shrew and tries to kill you and people ask to have her as a companion. Koth disagrees with you and people want to throw him out of the airlock.
He is very naive and ignorant of what the emperor has done. As it's been said, if you lived in a country where the ruler has been good to your people, and some foreigner comes along and tells you he's done horrible things you would have a hard time believing them. I have a feeling Koth will learn his lesson as the story develops in future chapters, and he'll see Valkorion's true nature (at least I hope he will).