Katrina was an actual disaster with all that goes along with it. (rioting, looting, thievery, assults) There were criminal gangs running the street with weapons.
In that case, law enforcement had no choice.
I don’t think you can compare that to what the UN want’s to do. The scale of operation is totally different.
You have a city, half or more empty and a surrounding rural area vs the entire USA.
There were criminal gangs running the street with weapons.
##
Which is when one needs his gun the most. BTW The Supreme Court ruled that the confiscations were a violation of the Constitution.
Bad weather and crime do NOT provide the government with exemptions to the Bill of Rights.
“Necessity is the plea for every infringement of human freedom. It is the argument of tyrants; it is the creed of slaves. ...” William Pitt