wait for it....
Because it has a picture of a gun on it.
QUOTE
Nolan, and others, take issue with the sticker’s design.
“I would have appreciated something more subtle, yet still recognizable — a logo, perhaps, not a gun,” she said.
“You can’t look at this (sticker) and not think about Sandy Hook,” she said, referring to the 2012 school shooting in Newton, Conn., in which 20 children and six teachers were killed.