Not sure why you're saying he killed 3 white people. One of the victims was a black guy named Toreon Jermaine Hudson (on the news reports, not doxing him or his family). The killer was probably on drugs and the only political link was his t-shirt. This is a local story.

https://www.wdrb.com/news/bungalow-joe-s-owner-in-disbelief-after-3-men-killed-in-totally-random-shooting-at/article_794ac43e-fa39-11ea-b3de-dfcc1cc3bf9a.html