Are you really that obtuse?
Yes, of frikkin course. killing people is against the Law, both man's and GOD's.
You cannot begin to understand what happened if you can't understand a place beyond Law.
A place called SURVIVAL.
A place called TOTAL WAR.
Actually it's not always. "Thou shalt not Kill" is a poor translation, a better one would have been "Thou shalt not Murder". Many kinds of homicide, such as killing in self defense or killing enemy soldiers during a war, are not murder.