I never got the nuclear winter argument. Were they libs around when it happened? because they seemed hell bent on making that theory so.
Because according to Liberal Logic, us rubes are too stupid to realize their brilliance, so they have to come up with really scary scenarios to scare us into letting them have control. They do this with Global Warming (see Al Gore's Why it's OK to Lie on Global Warming) and they tried to do this with the Dinosaurs. "If nuclear winter killed the dinosaurs just think what it will do to your children so you must join us to stop Ronald Reagan!!!"
Another similarity to global warming
Global Warming proponents want us to believe that even though at other times the sun drove climate change and CO2 never did, this time CO2 is driving the climate and the sun has no effect
and
The Asteroid proponents want us to believe that even though at other times massive volcanoes caused mass extinctions and other asteroid impacts (even bigger ones than the alledged Chixilub impact) never did, this time an asteroid caused the mass extinction and the 2nd largest volcanic event in world history had no effect.