I’m sorry you are confused. She was pointing out the fact that “mass shootings”, especially in American are just about all white males whose ideology is most similar to alt right groups.
You are the one injecting racism and not the subject by trying to bring in other crimes into “mass shooting” fold. You are doing this to distract from the facts and the focus the reader to something irrelevant to the issue…probably out of some form of insecurity.
She can discuss facts of crimes and not be divisive just by stating the findings. Now, the findings may be uncomfortable to you or others but your feelings towards the facts do not change them at all.