No you are not wrong, you are right.
Is that the same as the slave trade?
Are you angry about it?
Do you console yourself that your grandfather died doing something Nobel to protect his country?
Did he choose to join the army and fight in the war? (I assume it was in the war).
If you had grown up in Japan and had seen your parents racially abused and suffered from racial abuse yourself you may feel differently.
To be fair, I think you are absolutely right people should be over it by now. My point is that many people are not and are still dealing with the fall out from it.
Additionally type in to your search engine, 'the rape of Nanking' and ask yourself the question...........has Japan actually finacially paid a penalty for this? No! Many Australians also perished under the japs. Does Japan tell the truth in schools? No! Do the british having learnt from over two hundered years ban on the slave trade. Yes!