Your thinking is more flawed than hers. How is controlling law abiding people going to address crime? Is a registered gun any less lethal than an unregistered one? Criminals don't really care if the gun is registered or not, when they are finished with it they will just dump it in the lake anyway.
This one has been gone through repeatedly. It is not about addressing crime committed by law abiding people. It is about preventing some law abiding people from becoming criminals. It is about the leakage of legal weapons into the wrong hands. It is about those momentary emotional blowups that have led to, particularly, the murder of women by men y the use of legal guns. It is about the numbers of suicides that are committed with legal weapons.
What puzzles me is the emotional violence of the opposition, It is very little inconvenience for a very worthwhile purpose. Emotives like "Duck Hunters" should make one cringe.
None of that will ever be eliminated, but, some of it can with better control. And, it is about the investigation of those crimes that are committed by formerly law abiding people or getting officers to the scene of potential dangerous situations "armed" with the knowledge of what they might be faced with.