There are guys who do all sorts of incredibly dangerous work for the thrill of it. Test piloting aircraft was particularly dangerous back before it was possible to test and simulate things on a computer. Lots of people died right here on earth, developing supersonic aircraft, diving in the ocean, climbing mountains. Space exploration was incredibly dangerous but even with all the safety hysteria today I bet if you announced something like the early moon missions you'd have thousands of people lined up willing to take a very big risk to achieve such a thing. You really think guys willing to climb into a capsule on top of a gigantic rocket capable of delivering a payload to the moon are going to wuss out and not land and walk around if they have the technical ability to do so, even at great risk?
That's not the point of the movie. The astronauts are not depicted as coward people.
However, sending someone to a deliberate suicide mission in front of everybody is another thing. In all certainty, the questions raised by the movie were discussed by those involved in the space program.
And if in fact it is proved fake, that'll be the smartest political move of the 20th century.
It would also be the foremost Engineering achievement, covering as it would, the landing of multiple unmanned vehicles on the Moon, robotics which are right up there with today's best to drive the lunar rover around, & even before that, some sort of device to make a lot of footprints without leaving any marks of its own & to plant a flag!
By the way, all those unmanned vehicles, after depositing the faked evidence, then had to lift off in their entirety, apart from leaving one descent stage for fake evidence.
Add to this, that it had to be repeated in different spots, over & over.
Remember, that NASA had no idea how advanced the USSR was, so the"fakes" would have to be perfect.
Imagine, if the Russkis had been able to land their own version of an LEM close enough to the Apollo 11 landing spot
before it was supposed to happen.
Even a non-landing orbit would have "let the cat out of the bag" if the Cosmonauts had caught the very advanced robots planting evidence.
Another strike against the conspiracy---- in that alternate universe, what the hell was Apollo 13 about?
There would be no reason to include a failure in what would have been a successful series of deceptions.
Then we have the "faking" of communications & telemetry from the Apollo series.
There were large numbers of non Americans who were involved in this aspect.
Why would they want to keep such a hoax secret?
Also, the unmanned vehicles carrying all the "fake evidence" apparently didn't need any comms or telemetry to guide them to perfect landings at all times.
And where were they launched from?
Both the USA & the USSR kept a pretty close eye on each others rocket launching, as an unidentified one could be an ICBM sneak attack.
A series of unannounced launchings from somewhere else than Cape Kennedy (as it was then, before reverting to the old name), would set red lights flashing in the Kremlin.
The need for very advanced technology, precise navigation, a degree of security worldwide beyond anything then or now possible, plus the (secret) funding necessary to, in effect, set up a second "ghost NASA" to do the actual work, means that it would be easier to just send Astronauts to the Moon, which is precisely what happened!