Another example would be,

Imagine what would happen if, in the middle of a criminal trial, the defendant, who is facing a charge of murder, blurted out in open court, that the prosecutor had also committed murder.

First off, that unsupported claim (accusation/bald-assertion) does not prove the prosecutor is ACTUALLY guilty of murder.

And second, even IF that claim was 100% REAL-TRUE-FACT, that still has absolutely no bearing whatsoever on the defendant's case.

This trial is not the proper time or the proper place to make such a claim.

The defendant should present any evidence they have to the police and the police will decide if that case should be investigated on its own merit.