No. Hell no.
A stereo stolen from a car is an annoyance. A gun stolen from a vehicle goes to arm another criminal, and will result in further crime. This provides an endless supply of ammunition to the Brady Campaign and their legion of imitators....and adds to the number of simple people who are easliy convinced that "guns are bad".
IMHO, sometimes we can be our own worst enemy. People who say, "Yeah, I leave a gun in my car, and if someone breaks in and steals it...damn criminals anyway" refuse to accept any responsibility for their actions.
Cities, businesses and even private individuals get sued for "attractive nuisance" (which I personally disagree with)...and it is only a matter of time before a gun owner is sued for providing an "attractive nuisance" to the criminal. Yes, sounds ludicrous, but a number of attorneys have absoultely no scruples and (aided by useful idiot jurors) find every method to extract monetary settlements, regardless of the fact that there is no merit to the case.
Mark my words. It's a matter of time. And once the first jury finds in favor of the victim of a criminal who "found" his gun in your car...the floodgates will open.