If you grant some problems require policies at the state government level, which may have a wide range of geographic sizes and demographic compositions, how can

If you grant some problems require policies at the state government level, which may have a wide range of geographic sizes and demographic compositions, how can you not grant there are problems that can only be addressed at a national level? If you are worried about corruption and authoritarian tendencies, why do you tolerate them at the state level? Please lay out your tradeoffs in a way that might make your position consistent.