Media has a shaping effect on society as we know it… it is an undeniable truth... and as such… a film that skillfully highlights failure in that crafted structure means that in an inextricable way it is showing that the architects behind it… made mistakes.
When confronted by the mirrored truth of one's own shortcomings… you can either accept them and improve… or try to break the mirror… and its clear what approach is being taken now.
Modern media is witnessing its own shortcomings in the mirror that Joker holds up, and because of this... they need there to be some sort of tragedy to justify their own hatred.