According to this, Arthur Frommer thinks that people who exercise their 2nd Amendment right to keep and bear arms are "thugs" and "extremists" and won't visit Arizona because of state laws allowing said "thugs" and "extremists" to carry openly.
You don't spend your money in Arizona, and we won't spend our money on your books, or anything else you produce.
Frommer's contact page from the website:
Bite me, Art.
You wouldn't have the freedom to travel at all if it weren't for us gun-toting "extremists".