Coined that one (lefticide) myself, though I'm sure it's not original. I use it to describe the act of a leftist politically killing themselves or their own kind (eating their own), often by being, as you wrote, "obstinately or intolerantly devoted to his or her own opinions and prejudices no matter what the facts cleary demonstrate". Yep.
Well I hope you don't mind if I use it (I'll give you credit ;-)