I don't think it's as simple as a mere bug rate comparison. When a human makes a whoopsie, we blame that human. Maybe it's a bit uncomfortable, but it it works to prevent them from cooperating with attempts to inject whoopsies into their code.

If we create a culture of tolerating fatal AI hallucinations as long as they happen at a rate that's below the human caused fatality baseline, we create an opportunity for bad actors to use the "nobody is to blame" window as a plausible deniability weapon (so long as they don't use it too often).