Traffic violence has become so normalized that you don't even see it anymore. Twice as many people are killed by traffic accidents than are murdered per capita. Your ad hominem attacks do not invalidate the piles of evidence.
Gratuitious is: Unnecessary or unwarranted; unjustified.
If you think that is is unwarranted to describe crashing 2+ ton vehicles into human beings at speed as violence, I would wonder how you would describe it.
https://www.sfexaminer.com/marketplace/why-san-franciscos-st...
https://www.kron4.com/news/bay-area/san-francisco-man-arrest...
https://abc7news.com/post/pedestrian-elderly-woman-killed-hi...