There's a reason that stealing a $160 Hi-Point Pistol will land you on another level of trouble than stealing a $160 chainsaw. The tool itself is not evil; the likelihood that it's turned to an evil purpose in the event of its theft is far higher with a gun compared to gasoline or tools. Would you lend your gas can to someone you knew to be an Arsonist? If a stranger knocked on your door and said, "my car is out of gas, may I borrow your gas and replace it?"I feel like you do. I feel I have met my due by locking it out of sight in my truck. If it get stolen, file insurance and replace.
For those that feel bad about a stolen gun used to harm someone- would you feel the same if your car was stolen and then ran someone over? What about a gallon of gas that get stolen and used to burn down a building? If not, then it seams to me that maybe you are putting some greater burden upon a weapon. Kind of like gun grabbers do with AR15s or pistols that hold more than 10 rounds...
Guns, autos, hammers, bottle of fuel.... these are all tools that if used for evil, do not make them evil.
If someone steals a power tool, they are stealing it to profit from it, but the likelihood it's used for evil isn't any higher than it was when it was on the Home Depot shelf. Someone steals a gun, they aren't likely to be using it to hunt deer, or for their own CCP. They're using it for their own criminal actions or selling it to someone that isn't looking to ask or answer any questions, for
But to answer your question, I would feel the same if my car was stolen and I had left it unlocked with the keys in the ignition and someone took it and ran someone over. There's nothing more one can reasonably do to prevent their car from getting stolen.
I'm not going home to avoid leaving a firearm in a car while I'm running errands, for example. But I'm also not leaving it in my car overnight in my driveway. It's reasonable for me to bring it inside.