I personally wouldnt kill and mostly people wouldnt unless absolutely necessary
yeah most wouldn't, but people could justify it. for example atheists or agnostics could just one say murd3r is wrong and then the other day say it's right and they could justify it because they don't have a strong moral ground. i'm a muslim so i believe in the morals in the quran and so i believe in objective morality cz god is all knowing and all loving so he would know what's right and wrong.