I rely on guns for protection in life. God does not say 'This is la-la land.' God doesn't say 'Welcome to Earth. Everything's perfect. There's no crime. There's no murder. There's no death.' The world is imperfect and you have to be on guard.
I feel that the Christian experience and the Jewish one have much to give each other. If this open society continues and there is no return to political anti-Semitism then this encounter deeper than any theology may happen.