From what I can tell, things got better at some point after Thace's death back home, due in no small part to Shiro and his friends, but yeah. The Galra were pretty screwed up by their emperor's policies and the people they conquered suffered worse. Thace ended up joining a revolutionary group that wanted to restore the old ways before the corruption.
So Thace is always very conscious of how he can't really show too much negative emotion lest people find it threatening. It comes from a place of power over other people rather than weakness, but it was one of the things I was grateful to see that he understood.
(And while I hate that you've had enough experience to understand, I'm also slightly grateful that we aren't alone in that here, that there's other people outside us that understand.)
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So Thace is always very conscious of how he can't really show too much negative emotion lest people find it threatening. It comes from a place of power over other people rather than weakness, but it was one of the things I was grateful to see that he understood.
(And while I hate that you've had enough experience to understand, I'm also slightly grateful that we aren't alone in that here, that there's other people outside us that understand.)