Every time there's a mass shooting, I remember this piece of footage from Charlie Brooker's BBC series Newswipe. In it, a forensic psychiatrist outlines the guidelines for news reporting of such a tragedy, assuming that your aim is to prevent further ones.
If you don't want to propagate more mass murders...
Don't start the story with sirens blaring.
Don't have photographs of the killer.
Don't make this 24/7 coverage.
Do everything you can not to make the body count the lead story.
Not to make the killer some kind of anti-hero.
Do localise this story to the affected community and as boring as possible in every other market.
Here are this morning's front pages. Judge for yourself who has done a good job of heeding that advice, and who hasn't.