There’s two schools of thought.
One, commonly held by hippies holds that the Mayans were much more advanced and wiser than we are. The obviously lived in harmony with the Earth Mother and learned great things about the nature of the universe that we can’t even begin to understand.
After all they could build buildings out of ROCKS while we have to resort to using cheap substitutes like steel, and bricks. The Maya could predict the orbit of the planets and all we can do is navigate a probe to those planets and land on them. The Maya had spiritual healing and all we’ve got is MRI machines and brain surgery. So obviously they had some way of knowing exactly when the world would end and put it on their calendar.
The other school of thought, held by everyone who isn’t stoned off their ass, believes that the Maya did some pretty neat stuff with stone age technology but they didn’t have any more clue about the future than we do. They apparently believed the universe ran in cycles and placed the end of this cycle in 2012. Which was far enough away that none of them ever needed to worry about it, but close enough to make for some good stories…. Sorta like how a lot of our science fiction is set 200-500 years from now.
Here’s a quick test to see which one you believe…
Do you spend more money on recreational pharmaceuticals than you do on meat?
Yes/No
If you answer “yes” you can believe the first theory. If you answer “no” then you believe the second.