NRA threatens legal action over Virgin Islands firearm confiscation order

The Governor of the Virgin Islands had ordered the confiscation of weapons and such due to the weather emergency. From the news story:

The order authorizes and instructs the islands' adjutant general to seize "arms, ammunition, explosives, incendiary material, and any other property that may be required by the military forces for the performance of this emergency mission," as approved by the territory's Department of Justice.

New Orleans Mayor Ray Nagin signed a similar order in 2005 amid the destruction from Hurricane Katrina allowing the seizure of private weapons, which the NRA opposed in a federal court. Congress later passed a bill, supported by the NRA and signed by President George W. Bush, banning future seizures of weapons during emergencies.

So if it's already a violation of law, what makes him think he can get away with this? What made Obama think he could get away with DACA? The rules only apply to those in power when those in power want them to.