Until a purpose is discovered that was previously overlooked. The "poor" design of life you bemoan is much more elegant then any design by man.
You may fancy yerself an ace mindreader; yer not.
Ya can't even read a single functional brain cell, so yer surely not gonna be able ta read the mind or intentions of God. Jesus appears to allow free agency in us as you believe in your own religion, why could God not allow free agency in the development of all living things?
Sure they do. An omnipotent omnicient Intelligent Designer could do anything. The work is very impressive.