I have just discovered Black Mirror and I am loving it!
I did not see it coming that he was looking at kids but thinking back to everything you all pointed out about the child, the drawing I think he was. It also explains his reaction to his sister borrowing his computer, he sort of freaked out.
I kind of liked they were hardest on the two worst offenders here.
I went from feeling sorry for the awkward boy to being disgusted by him which is why I am loving this show.