Well, it could be black racism - or just plain old white hate. Turns out this guy has posted all kinds of racist vitriol urging violence against white people:Any motivation found yet for these horrific killings?
"The Daily Mail reported that a now-deleted Facebook account belonging to Darrell Brooks Jr., 39, urged readers to take “white ppl (the f***) out.”

Accused killer Waukesha parade driver posted toxic anti-white rhetoric
Darrell Brooks Jr., 39, let his vitriol rip in the wake of the murder of George Floyd
Watching the aftermath of this tragedy unfold, it's interesting to see the media do their best to ignore the racist aspect of this longtime criminal's mass killing compared to their branding of Kyle Rittenhouse as a racist white supremacist even though there was no evidence to support it and the three people who were shot while attacking him were white.
Right now the victim count for this dirtbag is about 60, with six dead - all white. During all this the media have done their best to either ignore the story or blame it all on the car; anything to avoid emphasis on the criminal who drove it, who happens to be black.
"CNN shocked on Sunday by declaring a moment of silence would mark one week since "a car" drove through the parade. Last week, The Washington Post used a similar tactic, tweeting the tragedy was "caused by a SUV" as both liberal outlets failed to mention who was driving the red Ford Escape in widely mocked, viral tweets. In the article chronicling the events of the parade, the Post continued to rely on the vehicle as the apparent cause of the bloodshed."

Media downplayed Waukesha parade attack when facts didn’t align with predetermined narrative, experts say
The media's downplaying and mealy-mouthedness around the horrific Waukseha parade massacre is no accident, experts tell Fox News.
There's no telling how long we'll have to wait for this guy's trial, but in the meantime we'll be dealing with the holidays and the discovery of a new covid variant in South Africa. It will probably take some effort to find any news updates on what his motives really were or the progress of the judicial process, which might take years. Soon the media will move on the other shiny objects like the 2022 elections and Darrell Brooks will be largely forgotten, along with the people of Waukesha.