Original sentence: A great deal of the show's humor revolves around making light of difficult topics such as abortion, rape, incest, spousal abuse, natural disasters, racism, anti-Semitism, and terrorism
Edited sentence: A great deal of the show's humor revolves around making light of difficult topics such as abortion, rape, incest, spousal abuse, natural disasters, racism, anti-Semitism, and terrorism (even the 9/11 terrorist attacks have been joked about)