I think this is just watering down the legal system unfairly into stereotypes.
Plea bargains aren't always bad. They can be used for a lot of good. Fundamentally the question is just whether judicial efficiency comes at the cost of arriving at a fair and just outcome. The base fact is that there are too few public prosecutors, judges to deal with the amount f crime we see, and it isn't easy to train new ones at a fast rate.
We should not see public prosecutors as simply an advocate of the state in the sense that the prosecutor has to seek conviction at any cost. They serve other purposes as well, such as filtering out only the most grave and debatable crimes for judges to decide. Prosecutors bring charges when they think there’s a good chance of proving their case beyond a reasonable doubt, if not, they just leave the case at that. Most of the time they will be impartial, fair and truthful as a public executive.
The judicial process is far from what they portray in the movies; the most common scene would be between two experienced legal professionals negotiating over charges, rather than two angry table banging persons having a go at each other in court. Very few cases would warrant the latter. Usually the public prosecutor and lawyer are both extremely experienced, and can tell from first glance what the outcome of the trial will be like since the cases will start to all look the same. So why bother with a trial?
The majority of crimes are minor and trivial. Offences like drunk driving, shoplifting, etc. Entering a plea bargain in these cases makes far more sense than trying to proceed to trial and getting a much more severe sentence. There are also cases mired in red tape that will drag for months whilst a person is in custody. Pleading guilty and getting a far lighter sentence will be preferable then. Plea bargains have done more good than harm in this regard.
If the evidence is weaker and not watertight, prosecutors will go for lesser charges. This is infinitely better than going to trial, and potentially leading to a hung jury, and resource wasting, particularly so in minor offences. Alternatively, if the shoe is on the other foot and the evidence is strongly against the offender, than it can make much more sense to go with a plea bargain as well.
You will still get to see the judge even if you decide to go with a plea bargain. The public prosecutor has no powers of sentencing, and it's still up to the judge who will hear the evidence before sentencing. Importantly, there will also be a preliminary hearing where the judges screen cases and weed out weak cases which helps the defendant. So it's not as if a person is simply taken from the prosecutor's office after some devious wheeling and dealing between him and your sneaky, money grabbing defence counsel and thrown straight into jail.
Imagine having a full blow by blow trial for every simple offence of drunk driving, trespass, or shoplifting. That would be awfully inefficient and a waste of everyone's time. We must recall again that the vast majority of cases are not rape or murder or kidnapping or crimes of that ilk.
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Sportshark case is just a simple offence of speed driving. There's nothing horribly biased or legally unfair about that. A camera or policeman catches you above the speed limit, and gives you a ticket. That's just about it. It would be a slippery slope to close one eye on the part of the policeman when a person goes over the limit by 5 miles, compared to 50.
There's only two sides in any case
No, real cases which are not straightforward, are much more complex than that.