Most states disarm citizens during a "state of emergency" with the excuse being it helps prevent looting. Also, citizens moving around while National Guardsmen patrol is thought to be too dangerous of a situation. Not quite sure how this differs from moving around every day amongst police and civilians, but the state somehow sees a difference.
During Katrina, many weapons were removed from citizens legally carrying and even taken from their homes. Last I heard, less than 15% had been returned.
“Malo periculosam, libertatem quam quietam servitutem." (I prefer the tumult of liberty to the quiet of servitude.). Thomas Jefferson
"All that is necessary for the triumph of evil is that good men do nothing."
-Edmund Burke, Loosely translated from Thoughts on the Cause of Present Discontents. (1770)