Though my position would be different if the government did this, a school is an institution that has a right to manage the events held on its ground. This seems less like a moral issue and more like a censorship issue. No-one should be censored for someone else's opinions, but if you want to do that, do that on your own time.
Yes, a Chicago school was correct in canceling a haunted house that depicted the Pulse Club massacre. Whoever thought it would be a good idea to depict such a horrible event should be ashamed of himself. This was the biggest mass shooting of all time, and we should only mourn, not use it for entertainment.
There are many other ways to have a great haunted house. I think it is incredibly tacky that this haunted house in Chicago depicted the Pulse Club Massacre. Many people died at the hands of a lunatic. It is still fresh on the families' minds that they lost their loved ones for this senseless act.
I feel that if the haunted house was just generally very scary or very distasteful, it would not point towards cancellation. However in this case, being that the haunted house was depicting a specific and particular tragedy, it was fair and correct to cancel it. We do not need to make individuals traumatic experiences into pubic entertainment.
Yes, a Chicago school was correct to cancel a haunted house that depicted the Pulse Night Club massacre. Halloween is supposed to be a night of fun and macabre, put a depiction of such a tragic and hateful event is disrespectful to the victims and all of their loved ones effected by what happend that night.