People use JAP in countries that aren't America because they didn't use it as a slur in the 40's. People in the US avoid it and use JPN, because it is a slur for them.
Seems pretty simple.
If I struggled to the end of my determination, to the end of my way of life with my followers, if the result is ruin, then this ruin is inevitable. Grieve. Shed tears. But you cannot regret.