Actually, the reason why this or Sandy Hook or the Aurora Theater shooting gets attention is because the victims are white.
Thousands of people of color are shot every year, no one pays attention and we do nothing about it.
But a family of nice, white Mormons gets shot, we pay attention for a couple of days and then do nothing about it.
the operative word is we do nothing about it.
A red Flag law may have prevented this situation, but the NRA rushes into court every year and gets red flag laws struck down.