Poisoning Democracy?

Sometime in the last 24, I caught a item that didn't make the national news and I get the sense, barely made the local Iowa.
On line, this non-explanation in the Clinton Herald: "The Palo Alto County Sheriff's Office says the plane owned by Steier AG Aviation was hit in a wing flap while spraying a field in Fairfield Township on Friday morning. The pilot landed safely at Steier's landing strip in Whittemore (IA)." 
Somebody shot it. Further research reveals 3 similar incidents in Texas, 1 in Idaho, 1 in Missouri, and couple in Canada. 
The gun mania, unique to this country that has produced a shooting every couple weeks often by the mentally disturbed guy, can't be attributed to the NRA alone. 

In fact, it makes a critical eye wonder if gun mania isn't a broader statement of failing faith in American democracy. What with the cancer rate, most people abhor being being sprayed, especially from the air, but they have no notion how to stop it. For a decade and a half, the Des Moines Water Works waited for voluntary curbs on nitrogen farm groups instituted to reduce nitrates in city H20. It never happened. They finally filed law suit on the local drainage districts which provide direct conduit into the Raccoon River, where the city gets its water. The farm orgs howled like proverbial stuck pigs. Who do we file suit on?