Perhaps you're right. That's the teacher in me coming out.
Clearly, Book is meant to be an audience surrogate. In that regard, he works very well. However! A huge part of Season 4 relies on the audience buying into the DMA as a galactic threat. By brushing literally everyone else affected by the DMA to the wayside, it dies a disservice to the narrative threat of the DMA. Yes, we know Earth and Vulcan won't be destroyed. But it would be nice if lip service was paid to the idea of it, at least.
And that gets to the heart of what the initial post is about. 10-C is basically absolved with a hand-wave. It would have helped the story, I think, to at least have reference to some kind of official request for reparations. Yes, they're repairing the rifts, but what about the people who lost family members? Who lost homes?
It could have been solved with one throw-away line. The writers chose not to. Whether that's because they didn't see it that way, or it just didn't occur to them, I dunno.
It is what it is. But, until the show says otherwise, I'm going to assume 10-C received a strongly worded diplomatic rebuke from the Federation and other nonaligned worlds.