You will find such shining lights as Sir William Herschel, discoverer of the planet Uranus and many other astronomical things, teaching in published material that not only was the moon and all the other planets inhabited, but so was the sun.
William Herschel is so famous as to have space probes named after him.
He was not alone in his ideas.
So, it appears, they copied what some leading scientists of the day, and earlier, had been saying in order to appear “brilliant” and then as science progressed they now look silly.
The difference is that one Wm Herschel did NOT claim...
...to be THE ONE God's direct-line spokesperson on planet earth...
...and therefore did NOT claim to be in God's special "confidence" on moon men...
...unlike Brigham Young and Joey Smith.