You're probably right. The thing is, everything we know about the Mayans has come from scientists/historians with no agenda for hiding information. Quite the opposite, everything they learned is pretty much readily available to anyone who wants to learn. It's essentially out of the US government, or any other organization's control as far as hiding any information about it. And everything that is known indicates that the Mayans had no intentions of predicting the end of time/civilization/etc. Or predicting anything for that matter, other than where the moon or Venus might be positioned exactly 6 months from now.
Some of the most knowledgeable people in the world regarding Mayan culture and history have said the entire Mayan end of world idea is totally bunk and completely a product of misinformation and overactive imagination. That's good enough for me..