When it comes to Army or Air Guard vs. Reserve (both part of the greater "reserve forces"), the Guard also has a state mission, so you don't want to take a state's total Guard force down too far. That may have nothing to do with the case you mentioned, but just pointing that out.
You make a good point. In my opinion, it's a good argument for states to establish a state defense force of their own. About half the states in the U.S. have done so -- I think they're an underutilized asset.
But rather than take care of their own internal needs themselves, most states would rather bitch and moan and complain to Washington to ask for more troops who get federal funding (e.g. National Guard) -- even if that strains our ability to fight overseas.
One of the young men brought up this. However, he did a mini tour in S Korea a few years ago on a volunteer basis. I believe that was during the Clintoon years.