[E. Pluribus Unum]

What part of “Thou shall not kill” does he not understand?

Actually, it's "Thou shall not murder."

There is a difference.

[Bob Celeste]

Actually, Exodus 20:13 Thou shalt not kill is one word in the ancient Hebrew, that word is ratsach. and it prohibits the taking of defenseless human life.

For a more complete explanation with an example, http://www.christianpatriot.com/10_20_2003.htm