Anyone who is stupid enough to advertise, however obscurely, that he holds a CCW is too stupid to have the permit.
Scouts Out! Cavalry Ho!
I disagree, profoundly. There was a time when my 2nd Amendment bumperstickers (including both my NRA Life and Instructor decals) clearly discouraged a pair of cretins from robbing an all night gas station and convenience store in the middle of nowhere, FL. The local cops, agreed, afterward.
I think that's a little bit of an extreme view on it. I personally won't put any stickers of any kind on my vehicles, it looks trashy in my humble opinion.
However, these tags can serve a purpose the same as the sticker at Hardees stating employees don't have access to the safe.
the other part of this is that some folks just like to be part of something, some sort of club... being a gun owner is something to be proud of even though I disagree about advertising the fact you are carrying. Carrying it on your hip in the open isn't much different than having a sticker on your window really. that's just my own humble opinion.
Will criminals take note of the sticker when they are looking for their next carjacking victim? I'd say that's a big maybe, but I don't necessarily think it makes someone "too stupid to have a permit" by any stretch.