concerned citizen
A concerned citizen is a citizen of a country, often uneducated or stupid, that is concerned by a subject recently brought to his attention, most of the time by the media but can also be from other, more local sources, like a neighbor, even if the subject never affected his life in any way prior to the hearing of it.
Fox news started talking about them Muslims in Iraq. Now, it's the only thing Bob talks about, nowadays. He's such a concerned citizen. But what about the middle east? He keeps asking. God!
Concerned citizen
A concerned citizen is a citizen of a country that is extremely concerned about a subject he just saw on TV, even if said subject does not affect his life in the slightest. Sometimes, the concern becomes permanent. When that happens, it is considered a mental illness.
There's no Muslims in town, and yet, ever since Fox news informed Jon of the dangers Muslims represents, he bought himself a gun for self defense. He's a very concerned citizen.