Anchor They did such a number on her in the press, painting the picture that she was the most evil person in the world, the defence couldn't find any expert witnesses willing to stand up and counter the prosecutions version of events. She had a US style trial by media.
Even at the time I was boring people about statistical clustering and probability. They needed to reel in a mathematician or two - which no doubt they will in an appeal. But put simply, the prosecution was outlining how the chances of Letby being innocent were tens of millions to one. Would you bet on an outcome that was tens of millions to one against happening?
Have you ever bought a lottery ticket? People win that every few weeks.