If the goal is to fight untimely death, we should take a hard look at the cold numbers. One will find for instance that smoking scenes in films kill far more people than those shootings. [1]
No, it should not happen ever again. However, we should not forget about the other priorities.
[1]: Regular exposure to smoking scenes makes children and teenagers far more likely to smoke later on. Smoking makes you far more likely to have cancer and such. And having cancer most likely shorten your lifespan. Despite the 3 layers of indirection, the numbers are so massive that a single smoking scene in a blockbuster is probably more lethal than a fully loaded gun.