I think OJ's jury was exceptionally stupid. Being allowed to dry in blood causes leather to shrink, but most people don't know that. The prosecution was also incompetent for failing to secure the guilty verdict of an obviously guilty man all because of a glove.
Legally in the USA, we have this thing called presumption of innocence. It is the burden of the prosecution to prove beyond a reasonable doubt that the person in question is guilty of the crime they are accused of. Also, crimes are investigated, not people.
In Trumps case, there wasn't even a crime, but he was investigated anyway. The investigation couldn't even show he was guilty, but they decided to say they couldn't prove he was innocent either. It was a complete perversion of the USA justice system.