Kill, don't kill, who knows?

In 1 Nephi 3:7 it says "And it came to pass that I, Nephi, said unto my father: I will go and do the things which the Lord hath commanded, for I know that the Lord giveth no commandments unto the children of men, save he shall prepare a way for them that they may accomplish the thing which he commandeth them."  

In Exodus 20:13 it says "Thou shalt not kill" which is pretty straightforward. There are no conditions placed on it. If you interpret the bible literally then you shouldn't even fight in a war. But even if you interpret that loosely to mean you shouldn't kill someone unless they are trying to kill you or someone you are protecting that's still pretty clear that killing should be avoided. 

In 1 Nephi 4:10-11 it says "And it came to pass that I was constrained by the Spirit that I should kill Laban; but I said in my heart: Never at any time have I shed the blood of man. And I shrunk and would that I might not slay him. And the Spirit said unto me again: Behold the Lord hath delivered him into thy hands. Yea, and I also knew that he had sought to take away mine own life; yea, and he would not hearken unto the commandments of the Lord; and he also had taken away our property." 

Once again we have a changing, inconsistent, confusing Mormon God. First Nephi says that God always provides a way to keep his commandments. A few hundred years earlier, God said don't kill and didn't give any conditions. Then God changes his mind and says "go ahead and chop that guy's head off, he tried and failed to kill you and stole your stuff, and who cares it's only one guy, it's better that he dies than your kids dwindle in unbelief." 

Just think about that logically for a second. God could have provided all kinds of other ways to preserve the scriptures for the Nephites. He could have had Laban stay passed out drunk for a day or two while Nephi got the plates and left. He could have provided copies of the plates, certainly some scribe somewhere was copying the plates if they were important. Nephi already knew how to write. Lehi knew how to write. God could have made it possible for them to copy the plates as a scribe or something. Heck, God doesn't have a problem sending angels down with flaming swords to make people keep commandments, why couldn't he send an angel to make Laban give Nephi the plates? Why was his only option breaking one of his own commandments?