We HAVE returned to the Moon, regularly, with satellites, probes and robotic missions. We haven't had any _manned_ expeditions since 1972 because they are expensive and dangerous.
The six Apollo Moon landings are among the best documented events in human history: thousands of pictures, hours of video, 382 kg. of Moon rocks, and millions of eye witnesses, including myself. There is not a single scientist in the world who doubts that they took place. To deny them is to discredit the magnificent achievement of the team which went to the Moon, and to reveal abysmal scientific ignorance.
The proofs of the Moon landings have been documented in detail on web sites like these:
http://www.badastronomy.com/bad/tv/foxap…
http://www.braeunig.us/space/hoax.htm
http://www.clavius.org/
If further proof is needed, NASA recently released images from the Lunar Reconnaissance Orbiter showing 5 of the 6 Apollo landers, still on the surface of the Moon:
http://www.nasa.gov/mission_pages/LRO/mu…
http://www.boston.com/bigpicture/2010/01…