" It's no secret that criminals steal guns from cars. Knowing this, why would any responsible person permanently store one there anyway, especially when it won't do you any good should you need it? This should be common sense, but you know what they say...."
Just playing Devil's Advocate...
It's no secret that criminals steal money from people on the street (aka mugging). Knowing this, why would any responsible person carry cash on their person.
It's no secret that criminals steal credit card info from scanners...why would any responsible person use a credit card to purchase items.
The answer is same to all three, reasonable expectation of security. You should expect that your car's contents and your wallet's contents would be safe (and a large percentage of the time they are). If we sink to the lowest common denominator, we'd expect everyone we ever see is a criminal and thus we'd never get anything accomplished, always living on edge or in fear. However, this sword bites both ways (for this argument)...if we have reasonable expectation of security, then why would anyone ever carry a gun that is not LEO/Military.
So, we have to accept that there is some grey area and that what works for some is not what works for others, and we cannot place blame upon the victim but rather where it belongs, with the criminal. Until we get out of the cycle of blaming the victims (the true victims, not those that would portray themselves as such) and blame the criminal for the actions we'll be at odds with this (il)logical circle jerk.