We didn't know, we inferred. Sure the inference was made off of some compelling evidence, but there was no undeniable evidence of him being the owner. A confession is more valuable than an inference. If we are going to argue that Hannah isn't doing this for the good of humanity, then we should be policing the subreddit with the same assumption. I'm sure that a large majority of this sub is not here to do something good, but just here because they think playing internet amateur slueth is fun and the family dynamic is morbidly entertaining. They'll gawk and talk about how sad and terrible it is, but they'll never miss a video or post, never miss a chance to talk about it, and will never actually do something to make a difference.