1. He realized that history has some "inertia", that is, the results of historical events are often preset to some extent, and even if he tries to change them, it may produce unexpected results. He didn't want to let history go to the unknown path because of his intervention, which is why he chose not to change history.
2. In addition, Yi Xiaochuan is in awe of history and thinks that history is a treasure of mankind. It is precisely because of its unique laws and processes that human beings can make continuous progress and development. Therefore, he doesn't want to tamper with history, but hopes that history can follow the original trajectory.
He also realized that history is the result of countless accidental and inevitable interactions. Even if he tries to change the outcome of an event, there is no guarantee that it will not trigger other unpredictable chain reactions.
Finally, Yi Xiaochuan also realized that history is continuous, and he can't divide history into independent events. If he tries to change history, it may destroy the continuity of history and lead to the rupture of the historical process.
Therefore, based on the above considerations, Yi Xiaochuan chose not to interfere with the development of history.