[YeGoblynQueenne]

Yes, people on HN are very enthusiastic about ANNs and Deep Learning, because they've heard it's a big technological revolution and they want to keep informed. In their enthusiasm, some say things that don't make sense (my favourite is a comment that proposed to train an ANN to acquire an imagination- presumably by training it on pictures of unicorns and elves as examples thereof).

On the other hand, I think there's also enough people on HN who know enough about those subjects, that the comments that get the most upvotes (and, consequently, rise to the top) are the ones that make the most sense.

Edit: to be fair, all the stuff about brains and singularities is not the fault of HN users. Very prominent researchers (Hinton, Schmidhuber, others) keep pushing the "based on the rain" line, for instance.