Of course people dying younger is a benefit to society. Old people cost a lot, they're not productive, and (unlike children) they don't have any productive years in their future either. Ideally we would all drop dead of a heart attack 10 years after reaching retirement age (this would also solve the geriatocracy we find ourselves in).

Instead we clutch to life far beyond any societal benefit and, in many cases, beyond personal benefit too, spending a fortune to delay death another few weeks or months… but with incredibly low quality of life.

That said, dying at 58 is probably of no real benefit. But everyone dying a few years younger would have prevented Brexit.