We did the same thing saving GM more than a dozen years back.
Think about what has happened in the past nine months. Russia, the country with the most nuclear warheads in the world, invaded its neighbor, where it proceeded to systematically torture and murder unarmed civilians, filling mass graves. Russia simultaneously threatened to invade members of the European Union and the NATO alliance, while threatening to use its nuclear weapons against any country that might dare to assist its victims in defending themselves.
In other words, there is a war in Europe, where the aggressor is one of the world's largest energy producers. How is this not the kind of "true national security emergency" (as you put it) that the SPR is intended to address?
It follows that if either 1.) demand drops or 2.) supply increases the refilling will create exactly the same problem in the future that releasing oil from the SPR was supposed to solve.
Translating this into HNese, your argument suggests that disk drive caching shouldn't work. The answer is you can fill your reserves at a much lower rate than you empty them, taking advantage of many small windows.