“On a lighter note, [Italy's] La Stampa daily reported that a gang of masked robbers had stormed into a bank shouting: ‘Relax, we are not Isis. It is only a hold-up.’”So when you're walking down the street and some miscreant leaps out at you and says "I'm not ISIS, Gimmie what you got!" and what you got includes a standard magazine of say 9mm hollow points, show some professional courtesy and only give him 2 or 3 of them. He probably doesn't want more than that anyway.
In the same situation the thug leaps out and screams "Aloha Snackbar." feel free to give him as much of the contents of your magazine as you can spare considering that he may not be alone. It's only polite you know.
In the case of the bank robbery the disclaimer was probably a good idea as if the customers and employees thought they were ISIS they might also think that they were all doomed anyway which might inspire some of them to counter attack resulting in injury or death to one or more of the bank robbers.