We must have very, very different concepts of defense.
This crude propaganda cliche doesn't offer anything for the discussion. If you take an emotional snapshot of a complex situation and assume that's the whole truth of a situation you almost always are pretty far from the truth - even if in some subset of reality this snapshot is true.
My right wing uncle with his gun collection is a bigger threat to the American people. Why did those 400 innocent people die?
[0] https://www.nytimes.com/roomfordebate/2016/01/12/reflecting-...