Your loss. You are missing out on an amazing film.I'm guessing the controversy MIGHT have something to do with the "late night" appearance on DeNiro's talk show. in the graphic novel "The Dark Knight Returns" there is a similar scene where Joker appears on the 'David Letterman' show and kills the entire crowd with Smilex Gas. I have nothing to support this theory, but I'm guessing, he probably does the same thing in this movie(?). IF this movie shows an audience-sympathetic, disenfranchised-white-guy, committing a large-scale mass-murder like this.. then I can see what all the fuss is about.
either way, I agree with previous comments -- I'm not interested in this. I also didn't watch "Gotham". and I have no interest in the Harley Quinn Movie. nor the "Pennyworth" series. ALL of these "alternate takes" on DC History are convoluted and contrived (IMO). the Joker was only created to be a "foil" for the Batman character. having a Joker-movie-with-no-batman, is almost as bad, as a Venom-movie-with-no-Spiderman. ie: why bother?