One of the contributing factors is the glamorization of the events by the media. Nobody really speaks much to that.

Mentally deranged person + gun + non-stop media coverage on the suspect of one event = the next event. Lather, rinse, repeat.

We really need some increased emphasis on mental health, effective treatment, and tracking this data to limit availability of firearms to these folks. I see no benefit with anyone taking powerful psychoative drugs having access to a firearm. That is specifically where anyone wanting to actually cut down on these incidents needs to go first.

Sadly, gun control is almost entirely aimed at stable law abiding citizens, with little or no attention paid to the mental illness aspect.