Moving/ turning, what's the difference ?
I'm all for having principles, but I think Thatcher's approach to things - very ideological and based on rigid practical convictions about how things should be - was sometimes questionable. Note I refer to her approach to things, I am not trying to make a political point or making any comment here on the merits or otherwise of her policies, an entirely different matter.
The principled position here is that justice should be done. I think that if you go beyond that and start taking an immoveable approach to questions of factual guilt or innocence, then you end up with miscarriages of justice. The whole basis of the criminal justice system, as I see it, is that it is supposed to embrace scepticism. There is no place for Thatcher's attitude in a criminal trial.