No one is asking for historical location data, but merely what the car recorded as your input and other driving parameters before, during, after a crash. Where exactly is the privacy interest in that?

>>No one is asking for historical location data,

I am not sure where you believe "no one" is asking for, or collecting historical data. In fact everyone from the Manufacturers, Potential Advertisers, Law Enforcement, everyone is in fact asking for and getting historical data

so where where are you getting this myth that no one is

Great. To provide that, all the car will have to do is record all telemetry and upload it to a server farm. After all, it could be months before the cops realize they need a new angle on a crash you drove past.

Why can't it keep it on a black box in the car?

This would actually be reasonable, and would match up with airplanes. However we're anticipating that companies will want access to this data en masse to keep training their ML.