I guess it depends on the circumstances. I'd have to judge it on a case to case basis.
I know my father probably doesn't care. He only owns one gun, a Smith 6" .357 magnum for home protection (which I don't even know if he can use properly
) - the gun formerly belonged to a Chicago PD officer and was his duty weapon for the entirety of his career to my understanding (so it would probably be safe to say it's been used once or twice
) - anyways, that's his gun.
He also owns a watch that was worn by a man while committing suicide (the guy jumped off a building). Somehow the watch survived unscathed. The man's family gave the watch to my grandfather (I think payment for legal services or something - although I'm not sure 100% of the details). Anyways, my grandfather passed it on to my father, who actually wears it every so often without even remembering the history of it.
Both the gun and the watch as far as I'm concerned, can be passed on to my brother. He's an anti anyways, so I figure it's the only way he's going to get a gun, and it wouldn't hurt for him to be able to tell time while he's at it.
To be honest, the watch creeps me out. The gun, not so much, and I actually serviced it for the first time in 20 years the other night (taking a mini vacation at my parents' house) taking it completely apart and cleaning and oiling every part as needed.
If the gun had been used in a suicide, I'd probably stay away, unless there was some majorly historical story behind it. Same for a murder. I wouldn't want to own a gun that had been used by a serial killer, but if on the other hand, it was formerly Al Capone's, I might be overwhelmed by the history enough. Or if it was Lee Harvey Oswald's Mannlicher-Carcano rifle - same. Although I doubt that's ever going up for sale.