When self-driving cars were first coming out a professor of mine said "They only have to be as a good as humans." It took a while but now i can say why that's insufficient: human errors are corrected by discipline and justice. Corporations dissipate responsibility by design. When self-driving cars kill, no one goes to jail. Corporate fines are notoriously ineffective, just a cost of doing business.
And even without the legal power, most people do try to drive well enough to bit injure each other which is a different calculus from prematurely taking products to market for financial gain.