Remember the discussion of the Orwellian "malinformation" concept the other day? True information that is dangerous because some will use it for purposes that lefties dislike? The public can't handle the reality of violent crime in America, so do whatever you can to cloak this reality and obfuscate. In this case, and in most cases of black-on-white/black-in-Asian street violence, the attacks are not "random." They are the opposite of "random," in fact. They are targeted based upon the identity of the victim. As you see in the footage, the killer announced to the other passengers immediately afterwards that he got himself "a white woman."
Think about something at some point in your life that you didn't like and made you so uncomfortable that you refused to deal with it. You had to pretend the defect or shortcoming didn't exist. That's where they're at, and that's where they've been at for a long, long time. And as the disparities across the board grow larger every single year, so does their need to deny that which we measure and that which we see with our eyes.