Title can't fit what I fully mean. So if someone invaded your home or attacked you on the street, tried to kill you, but failed, was incapacitated in the process, and begged for his/her life, would you spare him or kill him? While most people say it's wrong to kill under these circumstances, a lot of people in the news nowadays seem to give into their rage and end up doing the latter.
So what's right in the end? It's not like the police will say much if you made the choice to kill when your life was suddenly threatened.