[jonascord]

If the prosecutor cannot convince the entire jury of guilt, the defendant walks.

Your average DA is not going to become governor without a 95% conviction rate. It's why they don't like juries. Too much of a gamble.

If a DA consents to a jury trial, that are expensive and time consuming, he is 110% sure he can convince 12 goofs who can't duck out of the duty that the accused is guilty.

I simply explain that, having bought two Chicago cops, an alderman and a traffic court judge, I'm probably not good jury material. So far, nobody wants me on a jury.

[NobleFree]

If the prosecutor cannot convince the entire jury of guilt, the defendant walks.

Exactly - it's a protection for innocent defendants, and goes hand in hand with the presumption of innocence as a centuries-old cornerstone of American criminal procedure.