>No society has ever tolerated a murderer

Murder is the unlawful killing of someone. But the law, which is often guided by religious morality has been, and still is, widely different from place to place.

Murder means different things to those of different religious/cultural moral structures, therefore showing clear moral subjectivity.

Not to mention stuff like some cultures giving women equal treatment and others strictly controlling and limiting their abilities.

Moral objectivity only exists from a very, very wide angle for broad subjects with little nuance.