The prosecutor doesn't know if the person is guilty or not. They believe they have enough evidence to prosecute. At that point, they're minimizing the public

The prosecutor doesn't know if the person is guilty or not. They believe they have enough evidence to prosecute. At that point, they're minimizing the public expense of prosecuting, by getting a guilty plea. The problem is when the junk science makes everyone convinced of guilt. Once that happens, nothing good is going to happen.