just a reminder, while i agree what japan did was horrible, it was just as horrible as what your own leader did to your people in the middle of the 20th century or as horrible as what most european powerhouses did between the 15th and 19th century.
China Japan relation summarized.
Japan only has 1600 years of recorded history, 1400 years of actual civilization. And they spent 400 years thinking about how to invade China.
From colluding with the Spanish during the 1500s to colonize China (Empresa de China plan), to invading Korea in 1598 as a springboard to invade China, to 1894, to 1931 to 1937.