Try watching a 4-year-old recount the night when his enraged father shot the little boy’s mother and grandfather in front of him. If there’s a stronger word than heartbreaking, it would be apt for that story and for the others told in “Making a Killing: Guns, Greed and the N.R.A.”

“The N.R.A. creates fear in order to sell more guns and make more money for gun manufacturers,” says one victim of gun violence. That and other arguments in this documentary are backed up with reams of statistics.

We’re told that a majority of Americans and members of the National Rifle Association support modest safety laws, including background checks on all gun purchases. Yet the association and its leadership, which receive millions of dollars from weapons manufacturers, work to block such legislation. Their actions, as detailed here, lead to more gun sales and more corporate profits.