I think the Joker is an imaginary scapegoat. He is an attempt by the liberal entertainment at explaining away the evils of capitalism, by putting the blame at unrealistic “individuals with irrational minds” rather than realistic people in realistic circumstances.
He is also a symbol of violent anarchism, through which the media obscure the true solution that is revolution and abolishment of capitalist institutions.
How to piss off people 101.
Do you fail to remember how the tech world collectively cringe at one guy who intentionally injected malware into his own npm library to delete all data from Russia and Belarus?