These are just the few of the many that have lost their Bitcoins forever while there's just little to no chance for both of them to recover it, so we can conclude that they're totally lost forever. Should they give up or accepted that they're lost forever, these lost Bitcoins are like a donation to the community as its value retained on the market capitalization of Bitcoin.
yes sure, we have to thank to them. Because they lost 15,000 BTC, that make the bitcoin supply was limited. and maybe enough to make a new ATH if the request always is the same as the missing one. There was nothing they could do now, they were just giving up, and let's try to start Bitcoin again from zero. So if they continue to wail and keep trying to restore what they was lost that will waste a lot of time and energy. As I know, many people out there has lost their Bitcoin were greater than Stefan and James, but it was not revealed to the public because they were realize it could not be returned to their pocket again.