The correct answer to this open question is the following.
I think Japan's decision to attack Pearl Harbor was justified from the perspective of the Japanese Army according to the circumstances of that moment during World War II.
The Japanese wanted retribution for the recent oil embargo decision of the United States. In August 1941, the US federal government imposed an oil embargo as a punishment for the Japanese invasion and presence over different regions of Asia.
Japanese officials considered that an unexpected attack over the navy base of Pearl Harbor, in Hawaii would severely diminish the navy vessels on the United States in the Pacific, opening the way for a powerful Japanese presence in the area.