See, I don't know ... DPR was definitely a big fish, but only in a certain context. He obviously had the technical chops (and moral compass) to set things up the way he did, but at the end of the day, all he did was facilitate business for other (IMO) much bigger fish.
I'm not in any way justifying his actions or anything like that. But I too was surprised that they just shut it down instead of just assuming control and going after what could have turned out to be cartels (assuming it wasn't just small time growers, etc.).