So the astronauts don't sign a waiver or something?
It is absolutely not “unethical”. Being unethical would be failing to inform the crew of the risks they are accepting and not giving them a say in accepting those risks.
Our crews are involved with their missions for years. They thoroughly understand the risks. There are multiple opportunities to address risks that they or others might find unacceptable. Including going outside the standard process and taking the concern to a center director and then to HQ.
All assessed risks are presented at the Flight Readiness Review where the crew/crew representative gives their approval or the mission is delayed.
None of this means they aren’t exposed to catastrophic risks. We have dozens of catastrophic risks for each mission. What it does mean is we have sufficient controls in place to drive the likelihood of those risks happening low enough that they are acceptable.
Just look back at Apollo 1 incident. What he said is more or less true.. the risks are real.
Apollo 1? The accident where during a plugs out test the command module was pressurized to 16+ psi of pure O2, a fire started which doubled the internal pressure and due to the inward opening hatch they couldn’t get out leading to their death from smoke inhalation in a less than 15 seconds before the entire pressure vessel burst? That Apollo 1 incident? Yes I’ve looked at it.