You beat me to saying this, Waysider.
Life is not "pure evil" just as nothing is "pure good."
But just as having, say, a potato that is gnawed by slugs that have eaten it, or a piece of fruit that has been dropped and bruised - once you cut away the damaged areas, there's really very little that's usable left. Better to and get some new, undamaged, potatoes or fruit.
The "good bits" relating to TWI in any event are mostly the lower-level people (not any writings), some of which people, I am the first to agree, are passionate, enthusiastic, and awesome. But that is because they love God - and not because they love PFAL.