The same thing happened in Germany. The top level guys were tried at Nuremberg, but Nazi 'middle management' ruled West Germany for decades after the war. This, in turn, was an important motivation for the formation of the Rote Armee Fraktion.

Western liberal democracy often forgets (or pretends to forget) that history is a thing, and that people have memoeries. There are many more instances where Western foreign policy (often initiated by the US, supported by Europe) was beneficial to us in the short term, while having negative long term consequences. The CIA calls it 'blowback'. The last century in the Middle East and South and Central America is riddled with it. And then people turn around and ask 'why do they hate us?'.

I despair.