While technically correct (i.e. Federal powers are limited), realistically they can, and do, use the power of the purse to get cooperation. 'Oh, you want Federal resources for this? We're going to need you to do your part by doing X, Y and Z first...' Also, many many years ago we had a Congress that would actually pass laws that States would have to follow... but that was so long ago it probably sounds like fiction to most reading this.

The larger issue (and we're seeing it with the current crisis) is that many things are broken at the Federal, State and local levels and each level is busy pointing fingers at another level(s) in an attempt to redirect blame.

That's a good thing! The state governors at least nominally care about their people.