I sort of understand where the OP is coming from, and have personal experience of knowledge of family heirlooms inscribed with the family name/arms etc. which were disposed of, and yes perhaps sometimes they are sold for stupid reasons i.e. to finance a gambling habit or some other addiction, or invest in some silly business idea that went down the plughole or simply out of pure greed. But sometimes no doubt things are sold because people literally needed the money to eat/live. So I think you can just say what's done is done, not much point in crying about it 50 years later.