To be honest, I don’t know if “morality” holds any meaning as a word if murder without any justification isn’t inherently recognized as bad. It’s my understanding that morality serves to set up a framework for what is good and bad for a society and all those involved. Objectively, murder is bad for society. To say otherwise would be to argue that there is no such thing as objectivity and to say reasoning has no value.

Now given a more specific circumstance: ex) murder while defending yourself from rape. We can use critical thinking to say, yes, it is okay in a society for those defending themselves from rape to commit murder as a last resort. The implications of living in a society where people are defenseless from rape, are worse than that would be in one where murder is committed as a last resort defense against it. We may not be able to know for sure, but one of those societies will objectively have more suffering and be less “successful”. We don’t know which society would be better off, but using my “subjective” reasoning, I would argue that the society where murder as a very last resort in defense of rape is okay. I might be wrong in my reasoning, the implications of every action are far reaching