As with guns, some auto deaths are caused by people who break laws or behave irresponsibly. But we don’t shrug and say, “Cars don’t kill people, drunks do.” Instead, we have required seat belts, air bags, child seats and crash safety standards. We have introduced limited licenses for young drivers and tried to curb the use of mobile phones while driving. All this has reduced America’s traffic fatality rate per mile driven by nearly 90 percent since the 1950s. Some of you are alive today because of those auto safety regulations. And if we don’t treat guns in the same serious way, some of you and some of your children will die because of our failure.