Rendering aid is certainly the kindest thing to do and hopefully fosters the idea of mutual aid to ships in distress but to do so doesn't induce a moral obligation to save an entire species. Archer could have stabilized the crew and ship and went on his way. Depends. Did they offer a hand to help those they could reasonably help or did they just watch them drown? I'm not sure how to answer that question. I guess I've never thought about interrogating flood victims to find out if they stood around watching others drown.