Why did hapsburg emperor Joseph ii react negatively to wolfgangs Mozart's don Giovanni?

Habsburg Emperor Joseph II reacted negatively to Mozart's "Don Giovanni" due to its controversial themes, particularly its portrayal of immorality and defiance against authority. The Opera's blend of comedy and tragedy, along with its bold treatment of subjects like seduction and punishment, clashed with the emperor's desire for moralistic and politically safe entertainment. Additionally, Joseph II was concerned about the opera's length and complexity, which deviated from the simpler, more accessible works that he preferred for public performance.