I think this is the right way to look at it. Privacy is extremely important to me, but cars are basically lethal weapons. Using them on public roads has to come with a certain amount of responsibility that balances privacy against other goods.
Seems to me that smart car data is similar - in the event of a crash, a judge could issue a warrant for that data if it is deemed relevant to the case.
And either way, honestly, just don't drive like an idiot and this will never be a problem for you.
If technology can bring those people to justice I'm 100% for it, they deserve it and their victims deserve justice.
I you are "100% for it" then you can move to China today.