How does a Game of Thrones "mishandle morality"? In my opinion, the shows (and books) present human morality more realistically than any other fiction I've ever seen
For instance, when the butcher boy is killed, Stark looks mildly perturbed but doesn't protest about it, and is still willing to throw his lot in with the despicable Lannisters. It's mostly shrugged off, but the incident was far too dark for that. Or another example, Robb Stark sacrificing two thousand soldiers on a suicide mission which was a strategic feint. Although one can see how the tactic might work, it just makes no sense on a human scale, unless you buy into that glorious death-in-battle nonsense big time (on a Kling-on scale it would be ok).