Because pre-dead-Uchiha-family incident Sasuke would have been a really nice boy, and a good friend for little Naruto.
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Smile
Sasuke felt tall being carried on Itachi's back.
The sun was setting and there was one other person on the streets, a small boy who Sasuke looked at curiously. He was blonde and skinny with marks on his cheeks. Sasuke saw dry tear tracks against the dirty face.
He looked up and watched enviously at Sasuke and Itachi passing. Sasuke found himself staring into the light blue eyes.
"That boy seemed lonely," Sasuke said once they passed.
"Naruto is lonely. He has no parents. No big brother."
Sasuke hugged Itachi tightly. "I wish I had smiled at him just then."