There are several books and at least one movie made about this. #1, we don’t just summarily execute foreign soldiers, let alone foreign leaders. #2, there were war crime trials, #3 there was some bone of contention as to whether the Emperor was merely a figurehead or had any active participation (kinda be like executing queen Elizabeth for stuff Thatcher did.), and #4 there as a very complex political aspect going on.
The 2012 movie Emperor does a pretty decent job with this, and it’s a good movie
https://en.wikipedia.org/wiki/Emperor_(2012_film)
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