This movie is deeply sad yet it's true. The extreme violence of joker comes from deep grief and anger.
This movie has many good lessons.
One of them is, be kind to one another,dont make fun of no one. dont bulley. This world needs more kindness and humanity. we have to look after each other. joker is no joke its slap at face . It makes us know that, what extreme sadness and grief can do to a person.