I'd like to point out that making the player take care of the crew is not the same as making them care about the crew. If you want the latter, penalizing the player for not taking care of them is a wrong way to do it, as it will just breed resentment (for an example, look at Terraria players abusing NPCs because, among other reasons, recently-added happiness mechanics are obnoxious). If you want to humanize the crew, add some human interactions with them: shore leaves, (dis)honorable discharges, funerals. I wouldn't mind this sort of crew mechanics, if it's infrequent enough to not be annoying.