Collective Psychotic Break
Logically speaking, if no one had looked at the octopus head statue, perhaps the rules of The Lost Temple would not have been activated, and the anomalies might not have appeared. But that was clearly unrealistic.
No matter how much he warned, with the millions of survivors in the Eternal Alliance, there would always be someone who disobeyed and sneaked a peek. And the survivors who arrived later would also look. The rules of The Lost Temple and the anomalies were bound to appear, inevitable.
But for him personally, it really wasn't much of an issue. Whether it was the closest forces to him or people, overcoming The Lost Temple was not difficult. The girls of the Changsheng Adventure Group all fell into a deep sleep, and without opening doors, they basically wouldn't encounter anomalies.