Yeah, we have those things called safety regulations that protect people and don't allow anyone to just deploy whatever software they call "full self driving" that doesn't really full self drive the car.

Except regulations have nothing to do with this as Tesla doesn't follow those. Tesla update their cars with software changes in areas that by law requires the cars to be re-certified. For example if I go out now and do something that add 50 hp to my car or change the way its braking system functions (even if it makes it better) it is instantly illegal to drive the car until it has been approved (like an MOT test in the UK). Tesla don't give a donkeys arse about those rules and no government so far have dared do anything about it (Sweden almost did, then didn't). All updated Teslas are illegal in the EU as far as I can tell and that isn't even considering the whole GDPR can of worms that is their cameras.

Why? FSD even in its current state will save lives. Think of it as driver-assist on steroids.

The only time?

Not sure if the only one, but not getting ploughed by a Tesla with a guy shooting YouTube videos from the backseat certainly takes first place.