I thought the GSL stickers were noting the statistics where more guns have been sold and crime has dropped.
Just like in places that allow carry/CC/OC crime is lower than in anti-2A cities/states. So more guns == less crime == saved lives.
Now "we" know that the gun needs to be weilded in self defense or defense of others to "save" a life but if it works it works.
There was an ad on TV where I grew up for an amusement park that had annoying brats saying "fun WOW" over and over again. People hated the ad vehemenently but it got peoples attention and made them talk about it and remember the amusement park. It was even "fun" to mock the ad in route to the amusement park. So short and sweet works and short and annoying works too, I guess.