Heavy sigh. How do you imagine creation? How do you imagine yourself as creator? Snap of a fingers, and in a millisecond something perfect appears. It cannot change, because it is perfect. It cannot grow, it is perfect as it is. Doesn't need anyone to assist, perfect as it is; doesn't need to assist anything else, that's perfect, too. Or, everything has to grow and develop exactly the same way. If someone isn't like everyone else, worthless, of no use. To you, sterile perfection is what creation is all about.
As I said before, I work with both the norm and special ed. What you heartlessly dismiss (pretending you care soooo much), I see great beauty developing, great hearts, unique characters. Somewhere along eternity's path, they are not going to give up this existence of "deformed, retarded, constant pain" because it created who they became. Has it ever occurred to you in the next life, having it so easy now, we might be the ones with defects? We will be the ones with stunted growths? Truly work with special needs people and you might wonder that yourself.