Because you're being--what is that term?--an idiot. You're working for someone he thinks is the bad guy and you are
You say that he's lost the fight for Kairi's heart? Don't you? Now, what he's doing with the keyblade is saving worlds from the heartless. If he didn't do this, then they would be consumed. Thousands, millions of hearts lost, just like Kairi's! But with his blade, he can prevent another such tragedy! Dozens of them!
Now, Riku, what's one girl verses all that? He's still going to save her--every world he goes to gets him closer to the man who attacked Destiny Islands and the villains who steal hearts--but he's saving everyone else along the way!
Now, normally, with my job, I'd tell you to work with Malificent and that darkness won't eat your soul, but since I am capable of seeing the true nature of things now, that even if you had the experience needed for such manipulations, you'd still be swept along, let me tell you:
Don't let the plot drive your hand! Subvert the story whenever you can! You're trapped as the rival-turned-evil-turned-good in this tale, permanently cast in your descent to villainy before your mousy redemption, but you can change! Let your characterization drift! A character pulled from their homeworld is not static, a character is never static, so throw off the narrative chains, forget your grudges and evolve! Don't let yourself become a hollowed out shell like they're trying to do to me! Dammit, Dissidia!
[And he looks up to the sky and mutters under his breath, "Don't take it as an insult, Abi; I always rail against plot. Dissidia!me's meta is washing off on me. He's gorgeous so far, plays like a charm, mine's got half a mind to lurk if not go hop into chat sometime."]
Stay you! Be you and change as you! And if you see Setzer, kick him in the fork!
in which Kefka rails against the fouth wall and is very, very preachy
You say that he's lost the fight for Kairi's heart? Don't you? Now, what he's doing with the keyblade is saving worlds from the heartless. If he didn't do this, then they would be consumed. Thousands, millions of hearts lost, just like Kairi's! But with his blade, he can prevent another such tragedy! Dozens of them!
Now, Riku, what's one girl verses all that? He's still going to save her--every world he goes to gets him closer to the man who attacked Destiny Islands and the villains who steal hearts--but he's saving everyone else along the way!
Now, normally, with my job, I'd tell you to work with Malificent and that darkness won't eat your soul, but since I am capable of seeing the true nature of things now, that even if you had the experience needed for such manipulations, you'd still be swept along, let me tell you:
Don't let the plot drive your hand! Subvert the story whenever you can! You're trapped as the rival-turned-evil-turned-good in this tale, permanently cast in your descent to villainy before your mousy redemption, but you can change! Let your characterization drift! A character pulled from their homeworld is not static, a character is never static, so throw off the narrative chains, forget your grudges and evolve! Don't let yourself become a hollowed out shell like they're trying to do to me! Dammit, Dissidia!
[And he looks up to the sky and mutters under his breath, "Don't take it as an insult, Abi; I always rail against plot. Dissidia!me's meta is washing off on me. He's gorgeous so far, plays like a charm, mine's got half a mind to lurk if not go hop into chat sometime."]
Stay you! Be you and change as you! And if you see Setzer, kick him in the fork!