You don't need a fear in a dps spec, however the charge has a nifty root. Dull Pain, Cats Paw yeah thats fine for survival but if you need that you don't have a) good enough tanks or b) good enough gear / healers. Without Soul Destruction there's less peak and peak damage is what makes you take agro. Obviously Shink and a few others are far beyond me on knowledge and how to utilize an Assassin to its limits, but personally I find more sense in this one.
https://goo.gl/R6ko9j