There has been a multitude of tragedies throughout the years, and will continue, where innocent people are convicted for one reason or another and just like the current Smollett case there will be guilty people allowed to get off free. The injustice is one reason I am not for the death penalty in all cases unless there is video or incontrovertible evidence that a person was guilty. Too many innocent people have been proven innocent and saved from death row.
As for OJ I do fully believe he was guilty and further believe that there was someone else there with him and that someone, I believe, was his son. With respect to the glove that wasn't a mistake allowing it but it was a mistake the prosecution not bring in experts to counter it by explaining why the glove would not fit. I don't know for sure but I would bet that a glove soaked in blood would shrink up and if the glove was tight to begin with then it would have shrunk to a size too small to easily go over his hand.
Also, as I alluded to before, there is ample reason to suspect that there was more than one person there at the crime scene and possibly the glove was worn by the other person and so why would the prosecution not inject that into the trial? Television documentaries since have found enough evidence to indicate that there was a second person there, present, meaning two killers. Even if that isn't the case and there was only one I do believe that it could've been proven that the glove would have shrunk being soaked in blood. Either way OJ was found innocent and not convicted in that trial but he has at least suffered some penalties since and had to serve some time.