Why is society accepting/encouraging this mindset?

Rating: 1/10 (7 October 2019)

I really don't understand why does the people like Joker's character so much. "World is always unfair get use to it." It does not make sense at all that a person should response to the society this way. I don't know which direction people are going and what will they achieve by following, enjoying, encouraging, appreciating this kind of character.