@Darknezz just so you know there is a difference in killing and murder.
Murder is a crime because it is the ending of another humans life that is innocent and or killing someone in cold blood. Cold blood meaning killing someone unable to or unwilling to fight back.
There are plenty of examples of justified killing such as someone trying to harm you or another innocent, killing and stopping someone in the act of committing a crime that did or could result in the death or cause great bodily harm to you or others.
Murder is a crime because it is the ending of another humans life that is innocent and or killing someone in cold blood. Cold blood meaning killing someone unable to or unwilling to fight back.
There are plenty of examples of justified killing such as someone trying to harm you or another innocent, killing and stopping someone in the act of committing a crime that did or could result in the death or cause great bodily harm to you or others.