Besides what other said: it depends.
Maybe it was self-defense. Can you be sure that you saw everything from your angle? And what are the charges? Can the jury pick between 1st, 2nd, and 3rd degree murder (depending on the state)?
Then there are the conspiracy theory sort of ideas, like a second shooter who fired the deadly shot, and got away. Unlikely, but if the defense claims that, it has to be pondered.
If I saw it, I’d be in such a state of shock I’m afraid my memory would be faulty.
As for Trump, I generally think he’s a crook. But without hearing the testimony and judge’s instructions, I don’t buy him being definitely guilty of what he’s accused of. IMHO prosecutors often overreach.