I shot the Albatross

Why did the Ancient Mariner shot down the Albatross?
Two weeks ago, "It's obvious! Because we tend to hurt the things that we love," said Mr. Joubert. "So, I'm going to hit you with this book." (Haha! That was funny and certainly left this question with me for couple days.) Love is word he mentioned where I start to think of the Ancient Mariner's motivation to kill the bird. I don't think there is any specific reason (If you ask the Ancient Mariner, he himself probably didn't know how to answer this one) However, from the other aspect. The reason he shot down the Albatross is that he did not realize that God love all creatures and he should love them too. He was careless and did not worship living things. He did not perceive this until he found snakes beautiful. With many terrifying experiences, the Ancient Mariner had felt guilty and sorrow for his sin that had so much effect on the ship that eventually sinked and the sailors who never did come back again, even when the weather finally turned tranquil. He then learned that he should respect all the lives God created, which is also a way to respect the creator. However his wrong doing will never be recovered for he had to tell this tale time over time. Overall, he would not have killed the Albatross if he knew this earlier. And that is why I think the reason for this sin is the lack of realization that a man who lovers all God's creatures will have a happier life.