Those visors worn by the astronauts who landed on the moon were black not to show human face.
If one looks at the visor they wouldn't be able to see the face. The book 'Rocket Men' states that was deliberate in the fabrication of the helmets It was done by NASA to avoid having aliens see a human face in case of any possible hostile contact.
Is that true? Did NASA think there might be aliens on the Moon? Ok, but why not show the human face?
If anything, the humans would be scared of the alien creatures; just as humans dont like spiders, roaches, snakes, bugs, etc.