WASHINGTON — The nation’s largest gun-rights lobby today called for armed police officers to be posted in every American school to stop the next killer “waiting in the wings.”

The National Rifle Association broke its silence on last week’s shooting rampage at a Connecticut elementary school that left 26 children and staff dead.

“The only thing that stops a bad guy with a gun is a good guy with a gun,” the group’s top lobbyist, Wayne LaPierre, said at a Washington news conference.

LaPierre said “the next Adam Lanza,” the man responsible for last week’s mayhem, is planning an attack on another school.

He blamed video games, movies and music videos for exposing children to a violent culture day in and day out. “In a race to the bottom, many conglomerates compete with one another to shock, violate, and offend every standard of civilized society, by bringing an even more toxic mix of reckless behavior and criminal cruelty right into our homes,” LaPierre said.

He refused to take any questions after speaking.