It's honestly baffling how popular alternative history and other such conspiracy nonsense is to the public, even for entertainment. I don't know anyone who believes there's a conspiracy to hide the proof of P=NP, but major television networks have multiple productions dedicated to archaeological conspiracy theories. They're always so random too, like "Egyptians had US military helicopters".
It is baffling to me that people get so angry about what starts out as some fairly basic observations. The Sphinx, for example, has an obviously mismatched head that represents one of the later kings and also has some interesting weathering patterns. Also, many very old monuments have similar characteristics being made of very large stones without ornament. Some go way too far with their theories, but there is plenty of room to speculate about prehistory without being accused of randomness or conspiracy theories.
Early observations of ruins in the Americas concluded that some ancient civilization had traveled and built everything there since native Americans were considered to be primitives. Giving credit to the Maya for their language and literature was considered a weird conspiracy at first but ongoing study proved otherwise.
