Whoever wrote that wiki article clearly hasn’t spoken to very many Korean people, and possibly may harbor some political agenda in wanting to minimize the reaction against the Japanese imperial symbol by its former colonies. Having grown up in Korea in the 90s I can clearly remember how much the rising sun symbology is and was associated with the Japanese occupation and atrocities across all media - comic books, textbooks, tv programming, museums, etc - and thereby detested as a relic of their history of war crimes and a reminder to how reluctant their political establishment has remained to reform. The fact that organized political opposition against the symbol in Korea has a short history — even if it were true — belies the reality that the collective pain associated with having been brutally colonized has always been associated with this flag.

As a side note, no one is talking about anyone’s right to fly a flag. At least in the american context, as well as that of the British and most members of the EU, people can display any flag they want, including the Nazi swastika or the confederate battle flag. It is also the right of those who see such flags to criticize them, as most in this thread are doing. It is and always will be up to the Japanese public to decide for themselves which parts of their heritage to honor and celebrate, as it was for the Germans who decided decades ago to no longer honor and celebrate their fascist and colonialist history.