What I would be interested in seeing is a story about a character who's forced into betraying others in order to save a loved one--and in the end, decides not to go through with the betrayal (or perhaps never intended to, in the first place) because they know that the hostage in question would want them to do the right thing.
Ooh! Or a character who betrays her country/friends/family and ignores her own moral code to save her loved one... only to find that her loved one, disgusted by what she has done, turns his back on her. OR the two are reunited but their relationship is tainted by the things one had to do to save the other. Either way, the betrayer gets their true comeuppance.
And yes, I am intensely aggravated by this sort of shallowness in fantasy. Sometimes it seems like writers choose to ignore the moral implications of their characters' actions. The betrayer killed FIFTY PEOPLE and he's forgiven and everything is okay again? To me that smacks of laziness, or cowardice, on the writer's part. I would be interested to know if this anime further explored the betrayer's internal torment/guilt. Often the only thing worse than doing something you KNOW is completely wrong is getting away with it.
And to be honest, if a hero forgave a betrayer like that, I would question his judgement from then on. I would suspect that he was not very clever.
It's not the specific tropes that annoy me... it's the lack of true, deep, real consequence. The betrayal of fifty people could be turned into a story all by itself, rather than jammed into a larger conflict, and if explored deeply enough it might cease to be an irritating cliche.
But in the end, I suppose, fictional life is cheap. Death is an easy motivator.