Of course, killing infants and pregnant women is not "murder" when God orders it.  It is the lawful , just and warranted taking of life.  And genocide is not forbidden by the fifth.  But wasn't the genocide of the people of the Promised Land not convenient and expedient for God, since He needed to get them out of the way?   Naturally, because the One True Church is led by the Infallible, and is Infallible,  any wars it waged were just and those who died got what they had coming to them, as did the Canaanites.  I am glad we are in agreement on this point.