Someone who's name I can't remember once said.
"if guns causes people to be shot then pencils cause misspelled words."
I use that quote every single time someone brings up the second amendment as a negative.
Its very effective.
I prefer, "If guns kill people, where are mine hiding the bodies?"
We said to our son, "Guns are tools." We explained that yes, a gun could hurt or kill someone. But, so can a hammer. If tools are used in the right way, you are keeping intact the right to own a gun and a hammer.