> After all, if someone stole $1k of gold from someone a decade ago, is giving them (now deflated) $1k USD fair, or is giving them the same physical amount (now worth) $3k in gold fairer? Even if they bought the gold because the scammer asked them too.

I think that's an important difference. The fair thing is to "make them whole", to restore them to as if they'd never met the scammer. If they had a stash of gold that got stolen, the fair thing is to give them back that gold or the nearest equivalent. If they had a bunch of money that they sent to the scammer, the fair thing is to give them their money back; if they bought $50k in iTunes gift cards to send to the scammer we should be giving them back $50k, not 5,000,000 iTunes points. I don't see how that's any different for Bitcoin.