Rich Lowry of National Review Online examines student activism in the wake of the Parkland school shooting.

All you needed to know about student activist David Hogg’s speech at the “March for Our Lives” in Washington, D.C., over the weekend was that he affixed a price tag on the microphone to symbolize how much National Rifle Association money Senator Marco Rubio took for the lives of students in Florida.

The stunt wasn’t out of place. Indeed, it perfectly encapsulated the braying spirit of the student gun-control advocacy in the wake of the Parkland, Fla., school shooting.

These young activists are making our public debate even more poisonous and less civil, and are doing it as teenagers. They are precocious that way.

The Stoneman Douglas students experienced a horrific trauma. No one can deny their grief or blame them for being impassioned. And allowance has to be made for the fact that they are teenagers, who universally believe that they know better than their hapless elders (Hogg says the problem is that their parents don’t know how to use a democracy).

Yet none of that excuses their scurrilous smears of the other side in the gun debate. The student activists presume that there is a ready solution to mass shootings that everyone knows, and the only reason why someone might not act on this universally accepted policy is malice or corruption. This makes the other side the equivalent of murderers.