So what's your point? The weapon developers are correct of course. But the difference between weapons and super colliders is that super colliders are designer to help humanity instead of destroy it.
I can assure you weapon developers also think they benefit society. They usually say: WWIII did not happen only because of nuclear weapons. The question here is, what would benefit society more, spending said $21B on virology research or on a collider? Or maybe if you spend $21B on AI research, the computer will solve all the remaining theoretical problems of string theory in 0.21 s.
Of course weapons benefit society. I didn't say they didn't...