That's right and a more positive belief rather than saying " I think " which is all my eye as it leaves an element of uncertainty and wavering. It's certainly no good using the word " think " in a court of law.
WE aren't in "a court of law". Neither were Julie, David, or Bews when they used that expression. In fact, I don't recall that they ever said such words when they WERE in court. Such words were never in their remit. The jury -well, 10 of them- thought/believed he was guilty. They weren't at WHF when it occurred, so HOW could they have KNOWN?