Because they conflate the two. I've seen it in so many headlines regarding this event. It's not just the one casualty due to the car incident, they then go on and word it such that you'd think two police men died as a direct result of the protests.
It's way worse than a bunch of people walking around espousing racist views. Real-time subtle manipulation of large amounts of individuals is what actually matters. Democracy/society breaks down when you have large-scale brainwashing and suppression of dissenting opinions/views past a certain tipping point. Ironically, I'd argue that's a large component of how the Nazis in Germany rose to power.
Let's focus our upset feelings on the things that actually matter, like neo-Nazis in our streets, rather than on nit-picking journalistic investigations into them.