It was intentional hyperbole that Rush was using to poke fun of the socialistic style Obama-Volt, not that he actually thought GM was trying to kill its customers.   But it is unintentional hyperbole the institutional left is using to blame Limbaugh for the lay-off of 1,500 Volt builders.   Unintentional because unlike Rush the institutional leftists really believe their claim.    Liberalism is indeed a mental disorder.
(ThinkProgress) Relentless attacks on the Chevy Volt from Rush Limbaugh and Republican politicians have taken their toll, as General Motors has announced a five-week suspension in production of the range-extended electric car. Conservative enemies of clean energy and the Obama administration seized on isolated reports Volts with battery fires, calling the cars “Obama-mandated death traps.” Limbaugh even said GM was a “corporation that’s trying to kill its customers.”

These conspiracy-tinged partisan attacks have now cost American jobs, with 1300 workers temporarily laid off in the face of lower than expected demand for the innovative cars, even as gas prices rise. In January, GM CEO Dan Akerson bemoanedthe effect of the barrage of ideological criticism on the popularity of the 37 – 93 mpg car:

We did not design the Volt to become a political punching bag and that’s what it’s become.

Oh, and about those attacks? After an investigation, the National Highway Traffic Safety Administration determined that the Volt is just as safe as any gasoline-powered vehicle on the road.  (read more)