Scenario A) Crazy gun-toting mother who thinks citizens deserve to have the right to keep and bear arms goes berzerk, kills husband then herself. We need to ban guns.
Scenario B) Woman afraid of abusive husband realizes that she needs to defend herself. She does her best, but in the end the guy gets her and then kills himself.
As far as I know (which is little) Scenario B is a lot closer to the truth -- but the media would sure love to see Scenario A.
So, yeah, it makes a difference who did the shooting.