The us still manages around 7mmb/d, so what is in the spr is 100 days of us production. how is it hoarding to pump from one hole in the ground to another one? Is it hoarding to not produce oil in alaska's preserve?
The us is accused of insufficient savings. the spr is one of the few places where the us is actually storing something for future use that is likely to have value at that time.
The American Heritage Dictionary defines hoard this way:

A hidden fund or supply stored for future use; a cache.  Or To keep hidden or private.

It's not really hidden, so you could argue it's not a hoard.  OTOH, it certainly is "private," in that not just anyone can use it.

Personally, I don't see anything wrong with hoarding.  As long as it's not carried to extremes, anyway.  

everone hoards.  the spr is a hoard on a large scale.  keeping the car above 1/2 tank as "preparation" is hording on a small scale.  iirc, one of the factors in the 70's shortages was that everyone tried to get their cars up to F (full) at once.  200 million cars, and say 10 gallons per car, that's a sudden (fear fueled) 2 billion gallon blip in quantity demanded.

i think politicos try to argue against that kind of small sacle hoarding, and set as "bad" buying extra containers & etc.