If the trend was to wear such a pin ONLY to announce to the world that you are carrying, that would be a bit crazy.
But if the trend was limited to making a political statement supporting the RIGHT to carry, I can deal with that.
That would be no different than someone wearing a Sig Sauer logo t-shirt, an NRA hat, or a Molon Labe decal in the rear window of their pickup.
All symbols of being pro-gun.