Jeez! You can stop crimes just by posting a sign! Why hasn’t anyone thought of this before?!
Every liberal knows that. It's obvious that someone who is intent on using violence will be completely stopped by a sign prohibiting firearms.
Guys approaching a store pulling their ski masks down over their faces with guns in their hands.
Then they see the “No Guns” sign and stop in their tracks and start walking away.
“Dammit, not another one. Ok guys we need to find a different store to rob. How about that store? Does it have a sign in the window?”