It's been a while since I last read The Silmarillion, so some details might be wrong. The reason why Middle-earth did not have an industrial revolution is supernatural. When the Ainur sang the songs of creation, there was discord. Melkor, the mightiest of them, wanted to create something of his own, which was the root of all evil. The world they created was flawed. Within the world, the minds of those who seek to cre…
This could be called a lesser song, compared to Ainur's. Just a distraction really.
And in this state of distraction he acts.
Of course he's the bad guy.