Plea bargains account for over 90% of convictions in the US. Part of the cause is prosecutors can and do offer deals that rational actors would have a hard time refusing.

As a trivial example: imagine you are charged with a misdemeanor you absolutely didn’t do. Assuming you have no previous criminal record the state offers you a civil penalty (ie an expensive speeding ticket).

Are you going to go to trial knowing you could be sentenced to a year in prison? Keep in mind just paying an attorney to represent you through the trial will cost several times the civil penalty.