First of all, let's take Wang Mang, who is generally regarded as a time traveler, as an example. Wang mang, after becoming prime minister. Togu's reform was carried out internally, which is very similar to the Renaissance that began in Europe 1500 years later. In addition, Wang Mang also attached great importance to human rights. He emphasized equality for all over 2000 years ago and directly abolished the slave trade. Wang Mang acted like a time traveler, so now many people say that Wang Mang traveled from modern times to the past.
But I think Wang Mang is just ahead of the times and just has power in his hand. He did things at will according to his own ideas, so his behavior was recorded in the history books. Modern people saw Wang Mang's behavior, which could not have been done by the ancients. Maybe we underestimated the ancients. In the long river of history, Rainbow must be more than one person. Wang Mang just happened to be at the highest level of power, and what he did was magnified. Many small people may have the same idea, but their limitations have not been implemented or have been implemented and not recorded. Perhaps these thoughts and behaviors were just the common thoughts of progressive young people at that time, because nothing can be absolutely defined in different times and environments.
The second point. The ancient information was underdeveloped, and it was more dependent on word of mouth. In this process, information will be easily distorted, which may be the case, but when the fact is narrated from another person's mouth, it is already subjective, and perhaps it has reached the ears of historians, and there is no trace of the original truth.