Test the resolve of those who don't support the 2nd Amendment by asking them to post one of these stickers on their front door. Let them know that research has shown that almost all violent crime offenders choose victims who are least likely to own a gun to defend themselves. Non-gun-owning households depend on gun-owning households for their protection because criminals don't know the difference -- unless they put one of these on the door.
*Disclaimer: For novelty purposes only -- please do not actually post this on a household door as the occupants may be subject to visits by all manner of criminal molesters and miscreants.