It’s not about the mechanism: responsibility is a social construct, it works the way people say that it works. If we all agree that a human can agree to bear the responsibility for AI outputs, and face any consequences resulting from those outputs, then that’s the whole shebang.
Responsibility is an objective fact, not just some arbitrary social convention. What we can agree or disagree about is where it rests, but that's a matter of inference, an inference can be more or less correct. We might assign certain people certain responsibilities before the fact, but that's to charge them with the care of some good, not to blame them for things before they were charged with their care.
Sure we could change the law. It would be a stupid change to allow individuals, organizations, and companies to completely shield themselves from the consequences of risky behaviors (more than we already do) simply by assigning all liability to a fall guy.