This is what happened in Australia, and it explains Australia’s reduction in massacres with guns after Port Arthur.
The Port Arthur mass murderer was motivated by fame. He repeatedly asked if he had “broke the record”.
The Australian media almost begged for a mass gun killing so they could pass their population disarmament scheme before Port Arther.
Afterward, they proudly proclaimed it could not happen again, and emphasized how miserable was the life of the mass killer.
It is a little more complicated, but those are the essential facts.
There have been three mass killings in Australia by arson since then, but the media is not yet attempting to ban fire, so they do not get the firestorm of attention that “gun massacres” got before Port Arther, and afterward, to pass one of the most restrictive (and stupid) gun law schemes in Western civilization.
Here is a decent source for some of the facts about the media and Port Arthur:
http://www.class.org.au/ideas-kill.htm