Because everyone has their own meaning of existence, and no one wants their meaning to be erased.

Da Gu is just Da Gu. He doesn’t want people to just call him Ultraman Tiga when they mention him and only see the external things on him. He wants everyone to recognize him. existence, the changes he brings, instead of just thinking about him being able to transform into Ultraman Tiga to save the city, and being afraid of him, Dagu also wants to live like a normal person. You can't go out on the street and everyone you see calls him Ultraman Tiga without recognizing him. This is a very sad thing.

Moreover, when an ordinary person has the ability to dominate the world and can destroy the world in minutes, it is easy for people's mentality to change, to be pretentious or to regard everything as a coward, allowing themselves to have control. The thoughts of sentient beings, this is a very scary thing. Dagu should have said this to remind himself that he was a human being, and he did not become pretentious after becoming a giant of light to maintain his normalcy.