> Sounds like then there is not sufficient proof given
You can always find 1 person who will disagree about anything? If you have 1000 jurors that each vote independently I would find it hard to imagine that anyone can get convicted, even people you are basically certain are guilty. After some N, the probability of a conviction becomes indistinguishable from 0, which is not a good system either.
The number is typically 12 rather than 1000, and it's pretty unambiguous that it's possible to convince 12 random people to convict someone when the evidence is clear. And sometimes when it isn't.
You can always find 1 person who will disagree about anything? If you have 1000 jurors that each vote independently I would find it hard to imagine that anyone can get convicted, even people you are basically certain are guilty. After some N, the probability of a conviction becomes indistinguishable from 0, which is not a good system either.