And that's exactly it. In terms of strict Aristotelian logic, LondonJohn is right...but this isn't being held before the judging panel of the Oxbridge Debating Society. In a criminal trial, particularly one as notorious as this, where emotions are running high, there's a place for logic and there's a place for rhetoric. Having been told for several days that there's no doubt whatsoever -- and, actually, a "mountain" of evidence -- that the "spell-casting witch she-devil" and her erstwhile boyfriend committed the murder, it probably does no good to say that the evidence is "highly indicative" that they didn't do it. While we'd like to think that jurors will rule strictly on "reasonable doubt" grounds, when the prosecution has amped-up the emotional level as they have in their summations, it's safe to assume that some jurors may instead be balancing whether the possibility that they might be unwittingly freeing two "satanic" killers would be worse than incarcerating two people of which there's only a "highly indicative" chance that they're not guilty. In that real-world situation, there's a strong basis for rhetorically "fighting fire with fire" -- in other words, countering the prosecution's absolute certainty as to their guilt with absolute certainty that the evidence shows they're innocent. Maybe it's a little bit of cheating on a purely logical level, but I'm sure that one's innocent clients would prefer to stay out of jail, even at the cost of some logical precision.