Why does the government have to prove that a criminal defendant is guilty?

The requirement for the government to prove a criminal defendant's guilt is a fundamental principle of Anglo-American law, which operates under the presumption that a defendant is innocent unless and until the prosecution establishes guilt beyond a reasonable doubt.12

This burden of proof rests entirely upon the prosecution, not the defendant. The Fifth Amendment supports this accusatorial system by protecting individuals from being compelled to incriminate themselves, ensuring that the state cannot force a defendant to provide the evidence necessary for their own conviction.134

Ethically, the government’s role is not merely to secure a conviction but to ensure justice, which includes the duty to acquit the innocent. Because the state holds the power of prosecution, the legal system requires the government to meet this high evidentiary standard to prevent unfair convictions and protect individual human rights. Defense counsel is therefore ethically obligated to hold the state to this burden, ensuring that the determination of guilt remains the responsibility of the tribunal rather than the result of state coercion.24