Same reason that when they show the shooter's face all over the media and they give them tons and tons of attention, it typically spawns more copycats who are just lonely/sad/broken teens looking for the same attention. In the show, this teen's suicide was portrayed to have had an impact on many students/families/teachers etc for a very long time after the incident. It almost glorified the suicide and the methods of…
The scary thing is that both this article and the example you cited are used as reasons to limit constitutional freedoms: Limit second amendment more to prevent mass shootings. Limit first amendment more to prevent suicides. Really though, we should be focusing on the root cause: lonely/sad/broken people. Focus on helping/loving them and I bet suicide/mass shooting rates drop significantly.
We need some level of balance here.. unlimited guns and unlimited media has been a recipe for disaster.