Which, ironically, is used as the counterpoint to any sort of moral. Had that not been revealed, and had the traders not tried to take Kino, the 'moral' would have been "Help pplz cuz that's what you'd want".
Instead, we are left with a very powerful challenge to the common moral intuition that we have. That's why when Hermes asks, at the end, if Kino would do the same thing again we don't hear a response from Kino. The show isn't giving an answer, though it's not saying there isn't one either.
I know that's only one episode, but I'm seeing neither black and white, nor preachy.