Youi're showing a lot of cognitive bias here. It's very reasonable for the media to cover mass casualty events, that's definitely their job.

Another thing that has changed (which you haven't addressed at all) is that there are communities of mass shooting enthusiasts online who collect data on them, lionize the perpetrators, spread their manifestos, and encourage others to commit similar acts. People write guides with a mixture of justification for motives and sharing of practical techniques and advice, similar in format to the magazines periodically published by Al Qaeda. At least one such outfit has been designated as a terrorist group in several countries and several of its members have been arrested and are facing criminal charges.