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It is said that power corrupts and absolute power corrupts absolutely, yet Madara laughs as he watches his plans come to fruition. He knows he is corrupted, revenge and immortality made sure of that. He sees(fears) as the Kyuubi's chakra encompasses the smiling boy. Kyuubi is as close to absolute power as any human could reach. Yet, this jinchuuriki, this Uzumaki Naruto, used very little of the nine-tails' (his) chakra.
Madara watches in fear as his plans falter and fail, all because of one jinchuuriki, the one most hated(loved). Madara can not help but fear what will happen when this laughing man(who should be cold and harsh and bitter) allows the nine-tails to overtake his mind. Madara knows(wonders if) his revenge against Konoha is worth destroying the Shinobi nations and the world as they stand.
Naruto watches as his precious people kill and die. He knows as a Jinchuuriki he is expected to hate the people of Konoha; to have no precious people, but like Sakura he loves with all of his heart. Kyuubi's(Naruto's) chakra washes over the Akatsuki. Naruto knows(understands) he has power, but he has no need(want) for it. He does not become corrupted, because he fights for his precious people, as they and his determination are all the power he needs. His dreams have already become reality.