That's the engineering argument. The societal expectation, however, is that it's 100% better than human drivers, as in, it must not cause harm, ever. The real

That's the engineering argument. The societal expectation, however, is that it's 100% better than human drivers, as in, it must not cause harm, ever. The reality is that the vast majority of folks won't accept autonomous vehicles if they don't meet this high bar. Opinions my own.