"32,367 died in automobile accidents in the US in 2011, but no one is trying to take away your car."
Plenty of new regulations related to cars and highways every year to make them safer.
"If the Newtown tragedy happened differently and the killer used his car to run over 20 children. Would you want new legislation to limit your access to automobiles?'
Are you really asking that if reality was completely different would I maybe believe different things then I believed in this reality? Maybe. The Newtown tragedy is not a singular event. It's just the latest event.
"how is this so difficult to understand?"
How is the empirical fact that gun control works and limits deaths in many countries so hard for you to understand?