DJW,
I can see you are really struggling with this. Let's go to a dictionary:
MUR'DER, noun [Latin mors.]
1. The act of unlawfully killing a human being with premeditated malice, by a person of sound mind. To constitute murder in law, the person killing another must be of sound mind or in possession of his reason, and the act must be done with malice prepense, aforethought or premeditated; but malice may be implied, as well as express.
Does it make sense to you why people in general don't trust atheists if you cannot even admit that it would be morally wrong for someone to take your own life?
How could anyone feel safe under the control of someone like this?