This is a pretty specious line of reasoning when there are still people alive in HK who were directly impacted by this.
Personally, it's far removed from me, but I have heard/read stories from people who were there at the time, and I would not tell them "but hey, it was ages ago, and since then they've given us Pokemon!"
The same goes for Europe and the Nazi’s. I don’t say we should ignore history and I clearly state it is offensive to glorify WW2 military action on both German and Japanese side. I acknowledge their war crimes. By moving on I was talking about moving on from hating everything German or Japanese, like traditional clothing or food for example. In Europe we still memorise and honour the Nazi victims and the allied fallen soldiers. But we move on in terms of contemporary relationships between our countries. But I understand Germany of today went through a catharsis and recognition of their heinous past, while Japan seems to fail to condemn or apologise for their crimes committed. Yet I still have the opinion moving on is the smart thing to do.