I don't think we should hold present day Japanese for what was done two generations ago. But by constantly revising history textbooks and visiting the Yakusuni War Shrine, they are rubbing salt into an old wound, and insulting the people of other Asian countries.
To those Western editorials that blame China and South Korea for "flaming" nationalistic passions, I wonder what they would say if the Japanese change their textbook accounts of the Pearl Harbour. But maybe the right-wing of Japan have no guts at the moment to do that - yet. It's easier to bully fellow Asians.
As for Yakusuni, I am surprised that they haven't found a more imaginative way of honouring war dead, such as building a new shrine that excludes the names of the 14 "Class A" convicted war criminals, or moving the tablets of the war criminals out of Yakusuni. It is hard to imagine the German chancellor visiting a war memorial commemorating Hitler or Goering.
Until they stop humiliating Asians via the textbooks and Yakusuni, past grievances would always be a stumbling block to true warmth between Japan and Asia.