system
Given the following post, respond as if you're commenting on Reddit:
human
CMV: People have a moral obligation to debunk mediums because they take advantage of vulnerable people

Mediums are not legitimate and simply make vague guesses and have a skill for reading people. They use this to deceive people into believing they actually possess the supernatural power to speak to the dead. 

Many people want to believe that there is a way for them to communicate with their deceased relatives and this will cause them to focus mostly on the hits and ignore the misses when listening to the medium. This is predatory because they are deceiving those who are vulnerable as a result of losing important people in their lives into giving them money in exchange for lies. I also believe it is immoral to put words into a dead person's mouth since they are not there to confirm or deny the message. 

Exposing these con artists is important to help those who are vulnerable not fall into a scam.
gpt
I take it you saw the John Oliver on this topic. If not, you should. 

That said, people trade off between short term comfort and long term pain all the time. This is essentially alcohol, Oreos, and tobacco's entire business model. In general we allow this. 

Mediums have no such long term penalty. They don't cause cancer or diabetes or anything like that. As such, they are less harmful than Oreos, and Oreos are fine, thus mediums are fine. 

That said, this argument is contingent on mediums being benign. Once people start taking the advice to heart, and start changing their wills, or suing people, or arresting people for murderers - based on what the medium said, that is a whole other ball game. That must be opposed with the full vigor one can muster.