Citizens elect morons (when the election is not fraudulent - rare these days).
Attention Ladies: Wear a badge that says, "I have AIDS." Place a bumper sticker on your car: "AIDS donor on board." House sign in the front yard: "More congenital diseases welcome."
These warnings may avoid rape but I fail to see how they deter other violent crimes.
Best Bet: Get a concealed carry license. Ruger LC9 with Lasermax is a five-star choice.