Why?

Why did God make Adam ruler over the all the creatures of Earth?

"God said, “Let us make man in our image, in our likeness, and let them rule over the fish of the sea and the birds of the air, over the livestock, over all the earth,[B]Hebrew; Syriac all the wild animals and over all the creatures that move along the ground.” -- Genesis 1:25 to 27

Is man doing his duty? Are we doing our duty?

I don't get to see many animals everyday, all I the see are stray dogs and cattle. But I see beauty in them. Beauty of the Lord. They remind me each moment that the same Lord God who created them created me too and I must honour His Creations. I don't see my fellow Christians doing that. They don't think twice before hitting their dog or pelting stones stray cattle. Why are we the way we are? Why is it so difficult to follows rules laid down for us in the Bible? Why is it difficult for us to take ownership of the responsibilities the Lord has bestowed upon us?

When are we going to realise that each animal/bird or creature that God created didn't come about just like that. If you take a real look at animals you will find that there has been a lot of thought process that has gone behind the creation of these animals and hence they're perfect the way they are. Is there any other reason why a dog is a dog and not a cat and why a lion is a lion and not a lamb?

Please do let me know your thoughts on this subject.