The Rising Sun Flag has never had a political meaning. koreans themselves, who were enthusiastic supporters of Japan who voluntarily volunteered for the Japanese army during the war, have forgotten their past and are just only making noise.
It has been officially announced that the Rising Sun flag itself has no political intentions.
By apologizing, it generates a political agenda.
You are no need to apologize.
Here is an interesting blog about the Rising Sun flag. It was written by an American who is very knowledgeable about the recent controversy of the Rising Sun flag.
I hope it helps. Thank you.
You don't need to apologize because the Rising Sun flag and its design are familiar as a symbol of Japan all over the world, including Asian countries.
If it had problems, it would not have happened after WWII to the present.
Complainers don't realize the contradiction.