The problem with focusing so much on gun laws is that we have no idea if that will actually make a difference, and by the time that such a big change would actually take effect, it is certain that many more mass shooting would occur in that time and many more lives would be lost.
For those of you who know anything about stats, the graphs below indicate an interesting predicament.
So either the percentage of households that own guns and the number of mass shootings per year is an inverse relationship (which would mean more guns = less shootings, a debatable scenario), or there is no actual relationship between these two stats and it is purely coincidence. It is also possible that they are in fact related, but there is another factor involved somewhere that would prevent a change in either one directly affecting the other since correlation does not equal causation.
If there is no actual relationship between the percentage of households that own guns and the number of mass shootings, then something else is at play. Until we find what that thing is, which I have proposed here to be, at least in part, the copycat effect increased by the popular media, people will continue to die while we debate each other over politics.