I have a hard time ceding credibility to a writer who never heard of Hurricane Katrina...it was in all the papers for a while. Was it a complete SHTF scenario? When the cops become looters, I'd say it's close enough.
It may not have been big news in Argentina.
I agree with you. The author is projecting total colapse of society on a national level and that is unlikely.
I am prepared for the scenario that you have proposed, local natural disaster. Katrina is a good example, LA riots, another. These are temporary situations that are probably more dangerous than total colapse.
Katrina is a good example of a pistol being more useful than a long gun. When the authorities went house to house confiscating guns the only ones they didnt get were the pistols in peoples pockets.
People who didnt tell the cops and solders who searched their homes that they had a pistol in their pocket lost their long guns but not their pocket pistols.