Draco ripped out a piece of paper from an unknown book in the beginning of Chamber of Secrets. Hermione had a ripped out piece of paper talking about the Basilisk in the movie. Not sure I agree, but it's food for thought!
Snakes are innocent life, no evil. Through the looking glass this 'bizarro world', evil is Life. Wonder if that's why evil muggles are depicted stepping and squishing snakes, taking their skin to wear, . or making souls in female skin suits lesser than