It's crazy to think only three space programs have soft landed on the moon. And since the first in 1966, there have only been about 2 dozen soft landings on the moon.
The later Apollo missions weren't very popular with the public and were a potential political disaster for the president. Many people felt they were an enormous waste of money.
James Burke made a really great documentary mini-series in ~1980 where he interviewed a lot of the people involved in the Apollo missions. You can still find them on YouTube.
We tend to forget it's really hard to do.