Answer controversial arts shouldn't be banned because other people enjoy it and they enjoy working on it. The purpose of controversial artworks is to show how preposterous some ideas or the whole life can be.
Mostly, it means a spectrum of art pieces that are transgressive in nature and may contain discreditable or even offensive language. Even if the audience doesn't share them, art expresses opinions and gives insight into another side of the argument, allowing us to look into ourselves and judge the legitimacy of our beliefs. It serves as a reflection of the artist as well as their society, and ultimately, leads to a reflection of ourselves.