May the heavens bless Luffy for coming up with the perfect words to relieve Sanji of his terrible burden.
If you think about it, up to this point this arc was everything about Sanji not being allowed to be his true self - he was ridiculed and abused by his own family for being kind, for being vulnerable, for being human. Part of the reason why he was still in so much agony even when he was free to leave was because his kind and vulnerable inner self was demanding him to save even his cruelest abusers.
But Luffy gives him the affirmation to be who he is, as if it’s the most natural thing in the world. He’s basically telling Sanji that he didn’t expect any less of him, that such kindness is why he wants him back and why he chose him as his cook in the first place. To Luffy, no more explanation or apology is needed in Sanji being Sanji, regardless of what kind of danger that may bring forth. If that is not the greatest salvation for Sanji’s poor soul in this arc, I don’t know what is.