The two most likely purposes to have written a fictional account about Neil Armstrong's flight to the moon are to entertain and to argue.
The aim of every single piece of fictional Literature is to give the readers the possibility to have a good time reading.
The other purpose must have been to argue. Whenever a fictional account about a real life event is to open debate among those who support your view and the ones that are convinced that what your account is too far away from reality.
