Well, they can be valuable subjectively. Then again, useless things can also be valuable subjectively (e.g. a person obsessing about hoarding BS at their home).
But objectively, and in the long scheme of things, everybody will just be dead forever, so what's the point?
At best it's better enjoying a small intermission bookended by an eternity of nothing.
The universe, for one, doesn't care. It could just throw some asteroid at earth, and kill everybody removing all traces of history, culture, civilization, etc too.