I would also add that killing by God is not a sin. God alone has the power to make alive therefor it would seem to me that when He kills it is lawful and right.
Deuteronomy 32:38-40
39 See now that I, even I, am he, and there is no god with me: I kill, and I make alive; I wound, and I heal: neither is there any that can deliver out of my hand.
40 For I lift up my hand to heaven, and say, I live for ever.
Also Hannah herself by inspiration of God speaks these same words:
1 Sam 2:6 6 The Lord killeth, and maketh alive: he bringeth down to the grave, and bringeth up.
Remember that the days of our lives are numbered and the boundaries of our habitations have been established by God. We cannot go beyond them. Is it so shocking then that we should live or die by His command?
God is the original cause of all things. He needs no excuses or justifications. His plan is perfect and I have no doubt He will succeed in all He does. He gives life to all and is in the process of transforming His race into His very image that we, like Him, may inherit all things. A small price to pay for the glory that is to come.
Romans 8:16-21
16 The Spirit itself beareth witness with our spirit, that we are the children of God:
17 And if children, then heirs; heirs of God, and joint-heirs with Christ; if so be that we suffer with him, that we may be also glorified together.
18 For I reckon that the sufferings of this present time are not worthy to be compared with the glory which shall be revealed in us.
19 For the earnest expectation of the creature waiteth for the manifestation of the sons of God.
20 For the creature was made subject to vanity, not willingly, but by reason of him who hath subjected the same in hope,
21 Because the creature itself also shall be delivered from the bondage of corruption into the glorious liberty of the children of God.
God bless,
Alex