There are few universal truths, but one of them is this: Things can always get worse. (Even if that might be unlikely at any given time.) At this moment, we have enough normal food to not need to dip into the emergency stuff, though it's getting more challenging. Plus, we rather prefer normal food.
Basically, we don't consider our current situation an emergency yet.
Well, that's I ask about duration the food supply will last. If you have a 1 week supply, then yeah, don't dip in. If you have a 3 month supply, then I'd be a little more open to it (personally).
I'm pretty much fine with it as long as I think it's reasonable that I won't deplete more than some fraction of it before I can top it off.
If you won't use them now, when will you? Are we talking days, weeks or months?