"SuperMax" Prisons

I heard a story on NPR today about a suit to decide whether there should be
stricter hearings on whether an inmate should be sent to a "SuperMax" prison.
Super Maximum security prisons are in close to 40 states (and 2 are federally
operated). Inmates are in solitary confinement for most of the day and the
cells have no windows.

Isn't it strange that there has to be a term for what is apparently MORE THAN
MAXIMUM? Maximum means all, the highest quantity possible, 100%. How can you
have more than all?

This isn't just an exercise in semantics folks. I'm asking why maximum security
prisons aren't MAXIMUM already. We've got people in there for terrible crimes
(that just miss the death penalty) and they're running outside drug operations
from inside and sneaking in dope and weapons. Is this a college dorm
or a prison for bad people? If it's the latter, why aren't all maximum security prisons
"super max" instead of giving these people room and board at taxpayer expense?