Of the various things mentioned in regards to gun rampages, the media part of your title (in regard to media glamorization of gun rampage perpetrators) is, in my mind, somewhat of a valid concern, and even the video you posted seems to have come to that consensus as well.
Don't get me wrong, I wouldn't quite yet rank it up there with socioeconomic disparity and lack of access to mental health resources in regards to causes behind gun violence (or violence in general, for that matter), and I firmly believe that how the media has reacted so far is well within their first amendment rights. However, that doesn't mean the public can't put pressure on media outlets to voluntarily operate within a set procedure when reacting to future rampages.