“You shall not kill.”
It is one of the Ten Commandments brought to the people by Moses from God. Besides that, killing is against man-made laws, as well.
Yet, people are killed every day, and the murderers sometimes go free, for reasons not
necessary to discuss at this point. Many people have been killed, and continue to be killed daily in wars around the world, as they have since the beginning of time. We do not know how the slayers are judged in the Hereafter, and that is not our call.