Being direct cause of death is treated very differently based on mens rea, or intent. Assassinating somebody and causing a death by accident or by negligence carries very different penalties. Being a cause of something and being guilty of it are different things.

Instagram would be shut down if we knew how many teens commit self harm as a direct result of it.

Are we arguing that it shouldn't be?

It is certainly a bad thing, but I think it is an important note given the conspiratorial tone on some of the comments in that other thread.