jmunsell,
No you are not wrong. As gun owners it is our responsibility to make every effort to keep our guns out of the hands of those that shouldn't have them.
So, yes that means if anybody comes into your house, with or without permission, and picks up a gun laying on a table and proceeds to commit a crime with it, I do believe that owner has some moral responsibility and should have some legal responsibility.
You don't need house searches. As a gun owner you need to be able to explain how your gun got into the hands of someone it shouldn't have. If it was taken by force, you're off the hook. On the other hand if if you can't show that it was properly secured, you should have a problem.
I believe that the issue here is that as gun owners, many of us are not willing to take responsibility for gun violence that occurs from stolen or improperly owned guns. We act as if "So long as I've got mine", it's not my responsibility what someone else does. Given that approach, we should expect to continue to see the occasional mass killing, murder, etc. by people who got guns and shouldn't have.
If I remember correctly all of the mass killings that have occurred in the last few years were done by individuals that did not have to break into gun safes or rob gun stores to get their weapons. I think they got them from friends or family members.
JPM
Your responsibility should depend on how the truck was stolen. Did you leave it on the street with the keys in the ignition?
Brian,
"So you're saying the victim of a burglary could be charged with a crime?"
Yes, See my comments above.
" I'm not responsible for what others do with guns I've sold or traded off."
Under current federal laws you have no responsibility to determine the fitness to own a gun of any individual you plan on selling a gun to. So you right, you have no legal responsibility. What I am talking about is your moral responsibility. For you, once you have the money, your finished. I don't agree. When you consider how many postings on this site talk about the failure of people to take personal responsibility for their actions, I am surprised by your attitude.
When I sell a gun, I am very careful to sell to people I know well. Otherwise, I sell to an FFL.