These things were mainly publicity stunts. The supposed biohazard quarantine for returning Apollo astronauts was a theater performance, too. https://www.livescience.com/space/the-moon/the-apollo-moon-l... ( "The Apollo moon landing was real, but NASA's quarantine procedure was not" ) https://www.nytimes.com/2023/06/09/science/nasa-moon-quarant... ( "A review of archives suggests that efforts to protect Earth from con…
The actual claims of the paper are not that this was 'for show', but that NASA considered the risks unlikely and prioritized the more likely risks to the astronauts lives. I see how the authors got to 'so it was all for show', but it simply isn't true. There is plenty of evidence that the risk was taken seriously (regulations and treaties surrounding the issue, ICBC activities in the years prior to launch, the expens…
Unless it was not for the benefit of the astronauts, but the skeptical public back home? Hmm.