Thats a one off event. Even though pissed off when cops in New Orleans said they were taking the guns, the gun owners knew something.
They knew a hurricane had just blown through and that in the small area of the disaster, relief and rescue operations and restoring order was the order of the day. Nobody had the sincere belief that this was the beginning of a dictatorship to be resisted. So they turned em over.
This is a very different scenario from government moving to confiscate. It’s nuanced, and most people instictively know the difference.
Also look at how many laws are on the books already that allow the criminal justice system to confiscate your firearms.