"Are drugs involved, alcohol involved? Yes, all those things. But guns are among them. It seems that some people want it to be about everything and anything but guns. I don't think it's only about guns, but I think that guns, even if legally obtained, people's attitudes toward guns are definitely a part of this problem."

Costas said he understands why many people feel the need to have a gun, whether it is for safety in their home or elsewhere.

"Over the course of a year, how often do you think that would lead to tragedy and how often do you think it would lead to safety? That's my question."