Probably because most people can't touch them. Most people have never even seen Moon rocks in person. But anyone willing to do a little work can compare images well enough to recognize the truth of Apollo in the privacy of their own homes.
Originally Posted by R.A.F.
"Now everyone was giving her that kind of look UFOlogists get when they suddenly say, 'Hey, if you shade your eyes you can see it is just a flock of geese after all.'"
"You can't erase icing."
"I can't believe it doesn't work! I found it on the internet, man!"