Let's break this down and look at it a different way.
If my hobby were shooting guns and I were to set up a shooting range in my garage and I killed a neighbor, am I responsible?
If my hobby were fireworks and I was making them in my kitchen and burned down my apartment building killing 3 people, am I to blame?
The driver is engaging in a dangerous hobby in a reckless manner. We all know racing is dangerous because people die even in controlled conditions. We know he is being reckless because he is not racing in a place designed for it. When you put others in harms way based on your own stupidity, you face consequences.

lol, a new layer of enshittification?