So you want a source. My fucking source is everyone I know and pretty much everyone in this forum. It's a ridiculous race with 0 backstory, 0 appeal, completely hysterical. They look ugly, are weak willed and have nothing of value to add to the horde.
I could go on and on about why they're a worthless race to add to the horde but I don't need to anymore. It's pretty obvious that we don't need them and the majority of the player base despises the idea.