I’m not smarter in the law, but I remember the OJ trial. Just because all the evidence points to the obvious conclusion doesn’t mean that the result will be as you expect. Did the police do everything by the book, or is some of the evidence they’re relying on tainted? Did a cop worry the evidence wasn’t going to be enough and plant some more? Was he caught? Did they forget to read him his rights before interrogating him?

The trick with legal cases is that the prosecution basically has to avoid making mistakes, and it’s up to the defense to find a mistake they made. One major difference between a public defender and an extremely expensive legal team is the number of flaws they can find in the prosecution’s case before they run out of time.