I commented this on another person's post and realized, not before someone pointed it out, it wasn't the place to do so; however, I've decided since I can't seem to finish the long posts I'm currently (still) working on, I could transform this addition into a post of its own, so here:
These panels right here showcase the brilliance in Kishimoto's writing through Naruto's statement (characterization-wise) and the overall structure in which it's sustained.
Sasuke, and every Uchiha before him, has always been seen as a tool. The most obvious way to pinpoint this is how the most relevant thing people highlight of each clan member is their Sharingan (or lack of it, as those who don't possess it, are seen as "lesser members" of the clan also) and how it’s treated throughout the manga; how the very possession of such element negates every sort of oppression or discrimination (they can’t be discriminated if they’re reverberated and feared, the politics constructed around their doujutsu are specifically designed to exploit and contain such power, as those in power are doing it for the and "their" greater good). But such conduct it’s also shown through how the people perceived as good that move around Sasuke interacts with him:
Naruto doesn’t want to kill Sasuke, because he wants the “help” that he provides, or is about to provide, to be rewarded. He wants Sasuke to acknowledge him.
Sakura can’t kill Sasuke, because she wants her love to be reciprocated, she wants him to care for her, and to be prioritized.
Kakashi is incapable, but is willing, to kill Sasuke; because his existence is a testament to his failure as a teacher.
They have different methods to demand it: Naruto uses violence to impose his worldview. Sakura begs and Kakashi emotionally manipulates (or attempts to), but they all want Sasuke to live by them and their rules, their worldview.
Sasuke returned after Naruto won yet Sakura still pursued him romantically because the only one that managed to obtain his goal was Naruto (and Kakashi, who restores his honor), as he ended up “saving Sasuke”, therefore, was acknowledged by his rival; however, Sakura’s goal wasn’t “saving Sasuke from darkness” (as she very gladly tried to leave Konoha alongside him, yet he refused), she wanted his romantical reciprocation, which is what he had to give in order for her to finally return to the village and leave him to travel alone as he wanted.
And why do I say Naruto’s speech it’s brilliant, character-wise? Because by acknowledging their true motifs and their overall characterization we can achieve a very plausible conclusion: All of them, but specifically Sakura and Naruto, are incredibly simplistic. No, really. They aren’t anywhere near smart enough to comprehend Sasuke’s turmoil and the complexity behind it, so they oversimplify it to levels they can comprehend.
Both Naruto and Sakura feel lonely without Sasuke, and because that’s their primary pain throughout the manga, Sasuke being lonely must be equally painful for him as it is for them. The world around them is incredibly complex and it is embedded in convoluted political issues that entail immense exploratory work to dismantle. The only way someone can be “happy” inside such a system is by reducing everything to its most basic structures: Black/white, good/bad, happy/sad, and light/darkness. Naruto simplifying Sasuke’s core to “being lonely” is very in character for him, as that’s not only Naruto’s own core (which he uses to project onto others) but also is the only way he can explain to others and himself why Sasuke needs “his help”.
Kishimoto’s tool to dispute Naruto’s perspective and actions inside the narrative is presenting counterarguments through the antagonists of the show; which is why there’s a dichotomy between Sasuke and Naruto’s characterizations.
The characters and their speeches/actions are the author’s way to either validate or invalidate, argue in favor or dispute both the narrative's and the protagonist’s stances on the issues he faces (as we can’t really separate the author’s intentions from the whole world he creates); this is not to say that Kishimoto’s writing is without flaws, as he does allow the narrative to swallow the antagonists’ ideals by destroying the characteristics that he gave them.
Kishimoto’s writing fails at the end of each arc, as he realizes that he’s written himself into a corner. Naruto is a Shönen that, as a specific type of manga, follows simple rules: the “good guy” should always win, however, Kishimoto allowed that “goodness” of the main character to be questioned by those that stood up against him, but he did end up gifting Naruto a win without allowing him any introspection, as he never truly gave Naruto enough depth to perform it.