I think the problem when fiction addresses the problem with revenge is that it fails to distinguish between "revenge isn't right" and "revenge is wrong."
Look at Scar. Scar is right in seeking revenge and justice for what was done to his people, inclusion of brother optional(honestly, it's just the straw that broke the camel's back in some way.) He is not right, however, in taking his revenge out on every alchemist he finds. That how he seeks revenge may be wrong does not make his need for revenge wrong, nor does it excuse the wrong that was done to him.
Arakawa(and thus, the anime) gets the distinction. Another writer, however, could approach Scar purely from the perspective of "Scar is killing people for revenge" which, IMO, would completely miss the point of the character.
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Look at Scar. Scar is right in seeking revenge and justice for what was done to his people, inclusion of brother optional(honestly, it's just the straw that broke the camel's back in some way.) He is not right, however, in taking his revenge out on every alchemist he finds. That how he seeks revenge may be wrong does not make his need for revenge wrong, nor does it excuse the wrong that was done to him.
Arakawa(and thus, the anime) gets the distinction. Another writer, however, could approach Scar purely from the perspective of "Scar is killing people for revenge" which, IMO, would completely miss the point of the character.