Earlier quoted context omitted.
All it took was a white mother (and US citizen) getting shot in broad daylight. As much as I hate to admit it, a large enough segment of the population needed something blatant like this to care.
It's not flattering to the US that the mother who was murdered needed specifically to be white for people to care.
There's such a long list of things one could say that about.
In this instance the "representation matters" thought process seems to bear out.
Folks talk about aspiring to role models who look like them. People also react strongly when this sort of thing happens to someone who looks like them.