For the people here trying justifying "tighter" gun control due to this and other related shootings:
Great job taking a tragedy and turning it into a political platform. You aren't being original, people have tried before you. Really, STFU and GTFO.
The reality is, shootings like this, however tragic, are statistically insignificant. National gun laws, on the other hand, affect everyone, period. They are outliers and are not a sound basis upon which to base policy. Enacting widespread restriction of rights in response to isolated events is unthinkably naive and ignores the source of the problem.
Think about what you are saying: due to tragic shootings, which directly affects a negligible portion of the population, gun laws, which affect a great portion of the population, should be made so restrictive such that even the least responsible gun owner in the nation cannot commit gun crimes. Think of an analogue in education: the curriculum should be watered down and slowed so much that the slowest student can "succeed", at the cost of everyone else's benefit.
At this rate, we should probably ban turkey frying due to the number of people killed attempting it.
Please save that shit for some other day.