For years he had suffered at the hands of the villagers. They gave him strange merchandise, charged him thrice the amount it would cost normally, and taught him the wrong way to do everything.
Oh, he wasn't stupid! He knew exactly what they were doing! And he was going to bide his time, waiting for them to relax and think he was a complete idiot, and then he was going to strike and kill them all.
His first opportunity was as soon as he failed the genin exams for the third time. Then Mizuki came and offered him an opportunity he couldn't refuse- steal the scroll and learn a jutsu for real, or finally get revenge on that stupid Mizuki for sabotaging each and every lesson he could. He got both.
His second opportunity came when his team left him tied at the post. He could have used demon chakra to burn through the ropes, then unleash his power onto the unsuspecting villagers, but he didn't. There was no point to razing a village that would be able to rise again from the ashes aided by their Sandaime Hokage.
Finally Orochimaru invaded, and Naruto took his chance. Jiraiya went to find Tsunade, and the Sandaime was dead. If he killed Konoha now, he knew, he would not regret it.
So he killed.
He killed his team first. Sasuke, the dumbass, as he was leaving; Sakura as she lay awake in her civilian bed; Kakashi when the jounin shot up to check on Naruto's seal.
Then going to the homes of the shopkeepers that had overpriced their rotten goods to the village pariah. They died slowly as he watched. He smiled, a curving, bloody canine poking through his lip.
The Kyuubi lived on in the body of Uzumaki Naruto.