The belief really doesn't matter in light of what we know now, which is that Facebook itself believed that there was harm and proceeded anyway.

A better analogy than those I've seen. Facebook is like a wildly popular hookah spot, probably partially due to the fact that this hookah spot is knowingly putting crack in the hookah (in a world where maybe not everyone knows how bad crack is.)

In comes a guy who, yes against all the "rules", hands out mouthpieces that filter out the crack. How bad is this guy now? How do we feel about him?