There is no report yet to tell that. I think YouTube is just a scape goat for the society problems that led to that terrible event; any day someone can come forward with a theory that the bad things on the planet are caused by X, Y or Z where X, Y or Z can be anything from Youtube/Twitter/FB to video games or drinking beer, then the reaction will be to try to ban that. I saw the ban that was the result of this event, it was illogic to anyone with knowledge of the matter, but it was well accepted by uninformed public.