Hook is not vehemently against killing people. He killed Merlin a couple months ago and almost killed the entire family. I don’t feel sorry for any of the villains on this show. They aren’t people. They are characters on a tv show and we are talking about how the morality of a television show is written and whether or not it is good or not. We are not talking about people.
I still think everything you cited is base level humanity. He sent a child out of the submarine instead of himself. He offered someone who had no where to sleep, somewhere to sleep and really that was more creepy then anything special considered he has tried to murder Belle on more then one occasion. Also, telling Charming to not kill someone in cold blood, once again base level humanity, is not some great heroic moment.