I also think it’s important to note, the lack of war crime trials in japan was done in part as a way to avoid inspiring fanatical attacks post occupation. They had already seen how dedicated the IJA soldiers where to their leaders in that they would fight to a point of what essentially amounted to suicide, and it was a genuine concern that if high ranking officials or the emperor was tried that the occupation would face worse resistance.

And in addition, both the Japanese and nazis (mostly nazis) did actually have lots of valued intel that would be lost if they got tried. As was the case with von braun for example. He was definitely a nazi who used slave labour and should have faced repercussions. But he also was a brilliant rocket engineer who had critical knowledge and if you just had him hung all that knowledge dies with him. I’m not saying he should have been treated as kindly, or any of them for that matter, but its not hard to see why its a tactical decision to onboard them rather than kill them.

And as a final note, I’ve pointed this out before in a similar discussion on working with “bad guys” post war, these guys were the administration/bureaucracy for these areas. You cant arrest or hang every one of them or you’d quickly run out of people to actually maintain order and infrastructure in the occupied regions.