Whatever a person is comfortable doing regarding the legal display of firearms or association with firearms is their business. I do think that what I see in this photo,
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certainly makes you and some pro-gunners feel good, but strengthens rather than weakens the resolve of anti-gunners, and is oft putting to the people in between that we need to convince to remain neutral or sway to our side to continue winning the battle to defend the RKBA. Unfortunately gun ownership is not a club, school, or team sport that a supporting bumper sticker has no potential impact on its continued existence. Shouting at the opposition is often perceived by neutrals and potential allies as disturbing the peace. Something that makes them less inclined to support your cause.