No, it's not the gun owner's fault for being the victim of a crime. It's the criminal's fault. Period.
But I see it as a mitigation of risk. We know there are bad guys out there. We know there is a possibility of being robbed. Folks didn't use to lock their doors at night before they went to bed. Anyone NOT lock their doors before going to bed? Before going on vacation?
So if I don't want my property stolen I will secure it to mitigate the risks of losing said property.
I don't keep a firearm in any of my vehicles. But I am guilty of keeping one unsecured in my bedside table. But with layers of defense I'm not too worried about that one. And it goes in the safe when I go on vacation.
I think it boils down to being lazy. Probably one of the reasons I pocket carry an LCP all the time. Even in the house. Too lazy to strap up my 1911 in 10mm every time I run an errand. 1911 in 10mm = modern Fudd.
Vehicles are too easy to enter. Why risk losing a piece of your valuable property? Would you leave $500 in cash in your vehicle without securing it somehow?
Risk losing a piece of valuable property? Folks have a 70k dollar truck sitting in driveway. More worried about it than a smith shield or whatever.