why would future humans bother bringing all these people back

i think it's worth reminding why doctors treat people now, in this time and space. they do it mostly because they want to save people. maybe a few do it for money, but past a certain point, the money isn't why you do it. i think it's a safe bet that doctors of a future would see these corpses as patients, and act accordingly. an analogy - think how we see heart attack victims as patients, and not how our medieval ancestors would have seen them (as corpses)

...literally nothing positive to contribute to the utopian future...

true, but, a good chunk of patients in hopsital today have nothing to contribute to society, and cannot contribute any more, whatsoever. we treat them anyway, because that's what we do. humans have consistently cared for others that are sick and have "nothing to contribute" throughout history, and that shows no sign of going away anytime soon