If you only read public school history textbooks, I can understand how you'd think they woke up one day and said, "Hey, let's attack Hawaii!" Obviously, that didn't happen. They must have thought they had a darn good reason or no other alternative, knowing the industrial power of the US would eventually crush them.
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Ack-Ack: I think we deserve more information. Please let us know the Mitsubishi company and building address. You can PM it, if you wish; I won't reveal it, except to the Mitsubishi HQ here in Japan.
It is very surprising to read such an accusation. You wrote that you 'always' feel strange, meaning this happens every year. I think this type of rumor should be documented and verified, since it creates emotionally charged arguments. It would be a significant shock to learn that this is true. Every company I have dealt with is keenly aware of the 5 days the US flag flies at half mast for their US subsidiaries, more so than average US companies.
Are you sure they are not tenants and the building management made this error?
Thanks, and I look forward to the information.