Okay, let me break this down for you easily.
1. Car makers can put whatever devices in their cars they want. It's up to you, the buyer, to either not buy cars with black boxes OR to petition your local/state/federal politicians to make selling cars with black boxes illegal. You have either choice, it's up to you.
2. Insurance companies can require black boxes in cars if they were factory installed in order to be insured. Though there may be laws that they might be breaking because many states require auto insurance, but I'm not a lawyer. Either way, again, two options: vote with your wallet or make this practice illegal by approaching your politicians.
3. The aforementioned black box information does not have to be admissible in court for criminal penalties, but insurance companies could black ball you for information obtained from the box. Also, affected victims do have the 100% right to go after you for CIVIL penalties related to any crashes. The only time the 'government' matters is when there is involvement of criminal penalty. A civil court could mandate that the black box information be passed over to the victimized parties for review, or the data retrieved from therein.
I like how people talk about 'right to privacy' but each example I've mentioned still falls 100% within the boundaries of privacy laws AND more importantly, the US Constitution. Remember, such 'rights' are only granted against GOVERNMENT, but private parties can require whatever the hell they want. You can bitch and moan up a storm about right to privacy and whatnot but remember, private parties have far more leniency compared to personal information. For example, a government might require a warrant to obtain information on you ; but a PI can do whatever they please. The only reason a PI is limited is because someone somewhere said it was fucked up and got laws added.