Then why not be open about your feelings instead of being all dark and emo (for lack of a better description)? Sasuke retrevial Sasuke pissed me off so much. If he had been up front about his feelings things could have been much easier though not as dramatic.
In Itachi's defense if I were a really cool cloak wearing supervillian and part of an evil organization I would go after the one who had the latent potential to defeat me right then and there. Althogh Sasuke might be able to evenually defeat Itachi, Naruto poses a more of a right then right there problem, not to mention Jiraiya.
Edit: Thank you for not mentioning the DBZ moments. However it is that same character who becomes the center of attention in The Entire Anime World vs. Goku arguments. Latent potential, my friend, latent potential.