I believe in God as well, but this is stupid.
Murder and defense from people trying to kill us are two different things.
The Bible also says in Jeremiah 28:8 and in Matthew 24:6-7 that, "From early times the prophets who preceded you and me have prophesied war, disaster and plague against many countries and great kingdoms." And "You will hear of wars and rumors of wars, but see to it that you are not alarmed. Such things must happen, but the end is still to come. Nation will rise against nation, and kingdom against kingdom."