If adequate security precautions hadn't been taken then, yes.
While I see your point, surely a more morally fitting target of funds that society could seize for restitution would be that of the criminal (the bank robbers, in the above example). Otherwise, you are judging the victim of a burglary as partially responsible for a bank robbery. While his property may have to some extent enabled the crime, it seems morally perverse to blame him for it... do criminals have no agency?
If burglars fallout over how to divvy up the payout from a robbery and kill each other, would you hold the homeowner partially responsible for the murders as they'd had so much lucrative stuff (widescreen TV, jewelery etc) to nick that it encouraged or enabled violence down the road?
I just want to see where your moral compass is pointing here...
It seems that about half the firearms in the US are stored unlocked and about 16% are stored unlocked and loaded.
That strikes me as negligent.
Probably depends on the situation. In the burglary crazed UK (or where I live for that matter), it might well be negligent to not lock them in a safe. In some areas, in homes without children/felons, perhaps not so much. And as for stored unlocked and loaded… I imagine that describes people who keep a gun for home defence. (i.e. it being in a "ready to use condition" is intentional rather than a result of negligence).