It is irresponsible. Nobody is arguing that point with you.The biggest difference between guns stolen from cars and guns stolen from homes is that guns stolen from unattended cars is 100% preventable at no cost to the owner. Every year thousands of guns fall into the hands of criminals because of this preventable act. Make up as many scenarios that you want but in my opinion it is incredibly irresponsible to leave a gun in an unattended car.
Legislating against it, is where the disagreement is.
This is a common sense matter...not a legal or governmental (over-reach) matter.
You can't fix stupid...and the government needs to quit trying. They're not exactly playing with a full deck themselves...