Ugh I have this weird feeling about Six of Crows because on one hand, yes, no one needs to help Kaz heal. They have no obligation to do anything for him.
On the other hand, Kaz had no obligation to buy Inej’s indenture, or hire Jesper, or protect Wylan. (He had specific reasons for Matthias and Nina). Like, yeah, they don’t owe Kaz anything, but they’d all be dead without him.
So when people are like “oh he’s gotta help himself help”, yes, he does, but also they’re absolutely allowed to help him and understand how truly hurt he is?
People help their loved ones heal. No one heals by being left alone, and that’s what happens to Kaz at the end of the duology. He’s alone.