A jury selection process lets both sides of a case interview jurors and agree on impartial and reasonable jurors. Estimates of wrongful conviction are between

A jury selection process lets both sides of a case interview jurors and agree on impartial and reasonable jurors. Estimates of wrongful conviction are between .13%-5% (wikipedia, miscarriage of justice), however the main thing that trial by jury affords is transparency and perception of fairness, since you are convicted by your peers and not some politician with questionable incentives.