? I agree with much of your argument and I've picked out some points to toss around.
I think that's a weak argument, Nazi Germany played a role in creating Israel and Napoleon helped create modern Germany but their role is not condoned. The US was the key driver in decolonising Africa and Asia when the UK wanted to Metternich the whole thing (ie pretend its still working). The Japanese were looking to be the Dutch as you mention with your pint about teachers.
Its a good point that the Japanese imperial playbook was essentially the British one, but with specific reference to the middle of the 20th century there's a particular blot on the Japanese record that exceeds the British at their worst, at a period when the Japanese were associated with the Nazis somewhat tenuously.
With regard to the OP its not smart to take a "well there's two sides to this story" this story as you correctly argue above is multifaceted. Its a gross oversimplification to vaguely state the IJN and IJA are owed for their liberation of colonies in the 1930's and 1940's when they were not. More to the point while you and I are constrained by reasons of space to somewhat simplify our arguments the Japanese education system is not, so there is no excuse for the whitewashing of their past. Western history is hotly contested in the Western system by SJWs UMCs (unemployed militia clowns that feature in Iron Brig's posts) DNC, RNC, commies and many others.
I'm very happy to pass my own judgement on Japanese Imperialism (and on Western Imperialisms).
I do find the point about cutification a very relevant one. Here your point largely holds good, as there are "cute" western representations that mock cultures. Once again there are fringe responses allowed "we are a culture not a costume and this is not OLK" memes etc. but the basic reality is people wil costume for fun without taking on board the implicit meanings other cultures associate. The little boy collection lollies dressed as a legionary is not condoning the massacres at Numantia or Masada.
He is indicating the band are morons, how would it be best to describe them? Serious question, its fair enough if you feel like the thread conveys bigotry when he's making appoint about ignorance.
I do find Japan cops stick and is parodied in Western society, mostly as sick and deviant alternating with awe-struck admiration.