"Civil and legal settlements are independent of each other, so the willingness of the City to accept the wrongdoing of their employee is their right - possibly as advised, in order to head of a civil law suit (again to be clear, independently of whatever outcome of the legal trial may or may not be) which could have potentially cost them far more."
Or perhaps they feel there could be $28m of damage in the event of a not guilty verdict so $27m will save them a $1m, I'd say that's just as fanciful as your scenario.
Whatever...
I think what we all know is that if Chauvin is found innocent, black people around the world are going to lose their minds, and if he's found guilty, American red necks will lose theirs.
There's not going to be any winner here.