America and the USSR agreed to partition Korea along the 38th parallel after liberating it from imperial Japanese rule.
Subsequent to that the Chinese communists agreed to arm and back north Korea in return for Korean support during China's civil war.
Later on North Korea launched an invasion of South Korea I feel like this is a very important point you somehow completely failed to mention. They then captured most of the Korean peninsula down to Busan.
At this point the US (technically the UN but most forces were US) reinforced the ROK troops reclaimed the lost territory and invaded the north capturing Pyongyang.
At this point China reinforced the north Koreans and recaptured Pyongyang the fighting then stalemated around the 38th parallel after years of fighting an armistice was agreed and the current borders were agreed.
Your protratal of the US deciding on a whim to butcher the poor north Koreans then impose a separation on them would be laughable in how poorly it conveys events if you weren't seeking to mis-atribute the cause of a war that killed 3 million people
You stop the regimen of drugs and the primary effect ceases https://en.wikipedia.org/wiki/Chemical_castration
I'm not arguing for the policy, I think violating someones bodily authority is inherently evil and should not be on the table even as a result of a criminal conviction.
But I think our objections should follow the science, we should object to the harm caused to the (falsely)convicted while on the drugs rather than the permencance of the sentence.