Hi, I'm an italian boy, so my language is not so good... sorry. I read your post and I can say only a thing: his imprudence may be very dangerous for the others on the road, he can find a car with a family having babies on the car... Nobody knows what happen in this situation... Skydive is very different, in my opinion, we can rarely compromise the health of the others skydiver... however, i've got a motorbike too (Ducati!), and sometimes I go very fast too, but if I see that I can make an accident with other drivers or if I take with me a friend, I moderate my speed... it's a question of respect for the people's life.
I hope you understood the meaning of my answer.
Bye bye
Teo