http://en.wikipedia.org/wiki/Hoplophobia

Hoplophobia is a pejorative[1] neologism originally coined to describe an "irrational aversion to weapons, as opposed to justified apprehension about those who may wield them."[2] It is sometimes used more generally to describe the "fear of weapons"[3][4] or the "highly salient danger of these weapons " [5] or the "fear of armed citizens".[6]