Dundee United’s American midfielder has returned from the United States to self-isolate ahead of the club’s return to training next week.However, the country he has left behind is burning with racial tension and outrage that has followed the killing of George Floyd in Minneapolis.The 46-year-old black man’s death at the hands of a police officer, who knelt on his neck for almost nine minutes, was captured on camera and has sparked protests all across America.Harkes has watched on in horror as innocent protesters – black and white – have been beaten and tear-gassed by heavy-handed police emboldened by rhetoric from Donald Trump.Live TV footage of protests in Washington DC being violently broken up were particularly worrying for Harkes as his.