If that project was the control software for an airplane, and thousands of people were going to risk their lives on that plane, I think we'd appreciate someone

If that project was the control software for an airplane, and thousands of people were going to risk their lives on that plane, I think we'd appreciate someone saying: "wait, there are still hundreds of potentially fatal bugs in the firmware. Let's fix those bugs and do some more testing before we trust our lives to the system." Even if there was a risk to remaining where we are (as in medicine), and the plane was our only hope, it would still be wise to know about the risks and make an informed decision. Perhaps, in theory, the system balances the risks, as you said. But in reality people often cheat, take shortcuts, make mistakes, or believe what they want to believe. We will probably always need the contrarians and skeptics to balance out the overly optimistic and the plainly dishonest.