The government doesn’t get to decide you’re guilty
I want to call out how important this is. This is one of the strongest checks against corruption in the countries that have it.
As a concrete example, if we didn't have this in the US, I'm not sure there would be much to stop Trump's justice department from bringing cases against Trump's enemies in front of Trump appointed judges, and sending them to jail. Jack Smith and James Comey would likely be in jail right now if we didn't have jury trials.