...and even then, prison time or executions are not the same as vehicle rules.
you are confusing two ratios. the number of fairly executed people and the number of guilty people who are acquitted are obviously totally different.
Personally, I'd say that number is really high, possibly infinite. I'm not inherently opposed to the death penalty, but I can't think of any fair number of actual murderers I'd be willing to execute if it meant the death of somebody who truly didn't deserve it.
The whole point of the "Better 10 guilty men go free..." aphorism is that the two harms are not equal, and that a guilty man going free is less than 10% of the harm of an innocent man imprisoned.
The driving interlock case is just a straight up classic trolley problem.
I suppose have some sympathy with that argument, which is why I said a minimum of 1:1 (a lower bound on the ratio).
Drunk drivers kill innocent people as well of course.
If not, why is 1:1 even remotely acceptable for this?