@Wibble can I claim whataboutery here?
You could see all the evidence and context in OJ's case (If I recall the court was televised? Too young to remember whether it was televised or not tbh, but a lot of this was covered in the show People v OJ Simpson), he was later found guilty in a civil court as well. In addition, a lot of the police work behind OJ's criminal case was bungled + the fact that a lead detective on that case was a Nazi sympathiser made it easy for a lawyer like Johnny Cochrane to put just enough doubt in people (re. police competence) and then make the whole case about racism (With the Rodney King Riots providing the perfect backdrop). I would like to think that the quality of police work these days is far better than what it was in the 90s, and I think that is a safe assumption to make right. I personally do think OJ is guilty, and that he got away with it because the police (And the prosecution as a result) were incompetent, but that is an opinion - and my opinion will not influence what OJ does with the rest of his life, and who he works for.
Mason has been cleared by the CPS pre trial in light of witnesses (And not just Neo Nazi police officer witnesses, the actual alleged victim and those close to her) dropping out and in light of new material being presented to them (As per their
statement). Manchester United have also cleared him after considering new material, that is not in public view.
I do think that these cases are bit different, and the only thing in common are that these are two cases of alleged criminal behaviour by pro athletes.
On your second point about being quick to condemn if he was an oppo player - If you want my POV: At least in the case of Mendy, I was ecstatic that he wasn't playing for City (As a rival fan, in a footballing sense), but I didn't judge him guilty/not guilty until the court verdict.