Smart and dumb move on Barretts part....you have to ask the simple question, "do I have more to gain or more to loose doing the interview?"
Negative side: draws more attention and negative publicity from people who may have been indifferent. Other local governments and cities may view this as a new crisis and take further action to restrict ownership. Newspapers and electronic media looking for fresh material will generate more panic and concern where none existed before. Brings future litigation which could affect other types of firearm ownership.
Positive side: Creates a fear amoung gun owners that these may not be available much longer, prices will rise along with demand. Barretts market with the military and law enforcement is still secure, he now creates a greater market on the civilian side akin to what the AWB did, hence panic buying. Making a public stand rally's some gun owners who were previously neutral.
A politician once commented about the publishing giant William Randolph Hearst....."never pick an arguement with someone who buys ink by the barrel".