That said, I do think he absolutely deserved to be released, not because he didn't deserve to be locked up in the first place, but because he's clearly been rehabilitated and has done great work during his time in prison. All that considered, ten years seems like a not unreasonable prison sentence for what he did. I hope he'll continue to do good when he's released.
He organized and operated a global criminal drug ring and conspired to have people killed. The only difference between DPR and Pabla Escobar is that DPR was running his drug business in the 2010s instead of the 1980s.
Because in my opinion the ethics of operating a drug ring is not as black as white as you state.
The existence of drug rings is an inevitable outcome from the war on drugs and I would argue the blame lands on the politicians who maintain the status quo that incentivises the creation of the black market for drugs.