What does Inoue mean at the end of the original Ultraman episode 23?

First of all, this episode is against neither monsters nor aliens. But a real person-Jia Milla. Jia Mila, as a country (the play alludes to the United States), can be seen from the fact that Jia Mila did not forget to throw mud at the American flag before he died. As the spaceship was forced to land on a deserted planet, he longed for help from his motherland and compatriots. However, human beings not only did not disclose the truth of his spaceship crash, but also deliberately avoided his story and did not rescue it. With great resentment, Jia Milla was baked into a monster on the forced landing planet without water, and finally chose to return to the planet that once brought her dreams and destroy it with all her strength. The drillers were unwilling to attack Jia Mila after learning the truth.

When Jia Mila, who was afraid of water, was killed by otter current, the Kurt team erected a monument for Jia Mila. "People who died for the human dream."

Obviously, the truth about Jia Mila will be closed as a taboo topic for a long time to come, and all these people who know the truth can do is say a few nice words.