Fear is isolating. Fearful people build barricades, arm themselves, distrust strangers. This is not the way of life to which faith calls us.
I don't think that fearful people do those things ^. I think that people that are aware of reality do those things. Its not fear, its surviving in today's world. Just because I carry a gun to protect myself, does not mean that I am afraid someone is going to try to kill me; it means that I am aware of the possibility and have taken precautions to try and prevent it.
Yeah its a place of worship and in a perfect world we wouldn't have to protect ourselves there, but in a perfect world we wouldn't have to protect ourselves anywhere so until there we should be allowed to everywhere.