That flag was support for people who were subject to one of the worst terrorist attacks in history.
Showing support for people victimized in such a terrible way isn’t necessarily a “political” act, nor should decent people be “offended” by it.
I hate to deliver the bad news but “ethnic cleansing” by African tribes often have bigger body counts—they are just not covered well by the mass media.
>>nor should decent people be “offended” by it.
True, but the policy specifies “offensive to other patrons” not “offensive to decent patrons”