The Newtown shootings also produced a flurry of calls for greater attention to the proliferation of violence in movies, television and video games.

“I get media’s focus on gun control. But [mainstream media] shows bias by failure to discuss impact of violent movies/video games on our culture,” former Bush press secretary Ari Fleischer tweeted Sunday.

In a POLITICO column, former Rep. Joe Scarborough (R-Fla.) lamented the “harvest sown from violent, mind-numbing video games and gruesome Hollywood movies that dangerously desensitizes those who struggle with mental health challenges.”

But advocates are short on concrete proposals about how to limit the prevalence of violent movies, TV and video games.

Attempts to limit children’s access to violent materials were prevalent in the 1990s and led to technology like the V-chip that allows parents to block children’s access with violent content. However, advances in technology have made some of those efforts obsolete, while others have run aground in the courts.