Try telling that to the average slob!
Tell the average slob it’s no different than a Grand Jury indictment, A grand jury only sees if there is enough evidence to to justify a trial, and like the House they do NOT look at any evidence that would clear the accused.
A full trial after indictment (or impeachment) is done by a body that hears ALL the evidence, not the effective kangaroo court that only hears the innuendo and rumors of a crime.
A Grand Jury could hear that the bank robber was the same height and build as the accused, had a limp like the accused, and that the getaway car was the same make and model as the accused’s car. They wouldn’t hear that the accused was the best man at a wedding in the Bahamas at the time of the robbery, nor see any of the wedding photos...