That's a little bit of a one-sided argument. There are probably a number of good rifles floating around out there that were stolen from historical societies back in the 1960s, 1970s, and even into the 1980s when the value of the item began to escalate. Many historical societies and smaller museums kept very poor records back in those days, and it was pretty easy for an item to "walk out" when no one was looking. I've seem a number of historical societies lose good items over the years, that I saw years ago, but suddenly are no longer there, and no good explanation by the Historical Society of what happened...primarily because of volunteer help in some positions, and poor or incomplete records for many items.
A theft is always a theft. If a firearm was stolen from an individual, rather than an historical society, would it make a difference? What about the original wishes of the family that donated the firearm...shouldn't that also count for something? The law is pretty clear in the United States, and we are all fortunate for that. Innocent people may get hurt in the process, but the initial party that lost the item was also hurt when it was stolen. We need to keep an open mind on some of this, and realize this will happen from time to time. But our laws are a lot better than the alternative. Shelby Gallien