The ugly is very appealing to man. It's instinct. One shrinks from the ugly, yet wants to look at it. There's a devilish fascination in it. We extract pleasure from horror. ↗
I also used these realistic sounds in a psychological way. With The Good, the Bad and the Ugly, I used animal sounds - as you say, the coyote sound - so the sound of the animal became the main theme of the movie. ↗
It's great if a pilot starts off great and if it doesn't start off so great it's not that big a deal: everybody's baby is born ugly. But you want to know, if given the opportunity: Where are we going? What's the story we're trying to tell? ↗