The OJ comparison is pretty poor. The people in the OJ case were absolutely murdered. As in 100% Criminal Minds murdered. This was never in dispute by anyone. The entire trial was about if circumstantial evidence could be presented that convinced a jury OJ was the perpetrator.
In the KR case there were 2 homicides committed by KR. This was never in dispute by anyone. There were direct observation witnesses, pictures and video of the actual event. The entire trial was about if the homicides were justifiable per self defense.
These are not nuances...they were very different cases from the ground up. Nicole Simpson an Ronald Goldman were and remain murder victims. Joseph Rosenbaum and Anthony Huber were adjudicated as being justifiably killed in self defense.