I think the possibility of becoming [in]famous for committing these heinous acts plays no minor role in the motivation of these maniacs. After all, you could get your face on
the cover of Rolling Stone. Then, people might read your manifesto and everyone will know why you were angry. You'll finally be heard.
If it were up to me, they would all be referred to only as "some loser" by the media* - their real names blotted from memory, along with everything else about them. They would only be mentioned briefly enough to point out that they were too cowardly to deal with life's problems like a normal person. The rest of the time would be devoted to remembering the victims and helping the survivors.
*Or some other not-so-nice moniker to that effect.