[Ainaserkewen]

Maybe I can shed some light on this...
Whoever said that Morgoth can't creat, only mock was right...
If we look at it from a religious point of view, Morgoth who is, let's say, a recreation of the devil, did not creat anything. And the theory that orcs were tortured elves and trolls were tortured ents, where did the word "Tortured" come from? Oh yes, the movie.
The devil, according to most religions that have him, didn't creat things either, brand new things, made from scratch that is.

Let's say for a moment that Morgoth didn't corrupt other beings into his services, but did creat mockeries of them. Take elves. He was jealous of the elves, he wanted to dominate them, so using his power he made his own version of elves, in other words, orcs. Not original, but not the same. I believe the Valar had the power to do that, not to make new life, but to re-creat it, althought that was really evil and terrible thing to do.
What's his name, the Valar who made dwarves, wanted children of his own so he made them, Eru gave them life because they were made out of love and not jealousy, so they weren't evil.

Just my view on things. Because "mocking" doesn't nessesarily mean torturing an already existing race, but try to recreat it would hit nearer to the mark, don't you think?