When there is an incident like this instead of trying to control gun ownership, there should be dialog about stopping the legal killing of humans ... through abortion and euthanasia. The evil of those activities permeates through society. It seems to be "easy" for some to kill the baby they never met...and the marginalized adults who can no longer fend for themselves.
Similarly, this was killing of unknown, never met individuals who were unable to protect themselves.
Stop the legal killing of the young and the old, and the rest of the killing will be reduced.