Yeah I agree with you on all that. I don't really see how you refuted any of my points but the first one though.
My point was that there's more to it than you're suggesting. A lot will depend on the circumstances, the charges themselves...
Example: Two men are drinking at a bar in state X, and get into an argument. A fight breaks out. During the fight one of the men picks up a chair and strikes the other man over the head with it. The man whose head was struck by the chair, dies. The one that lives, is charged. He's charged with:
- manslaughter (death unintentional but occurring during or as a result of an action that is reckless or otherwise could result in death) max penalty: 30 year
- assault (threatening to beat someone) max penalty: 1 year
- with a deadly weapon (the chair) max penalty: 5 years
- battery (physically beating someone) max penalty: 2 years
- drunk and disorderly conduct max penalty: 6 months
In the state of X the max penalty for a guilty conviction on all counts is 38.5 years.
The man during his arraignment intends to enter a plea of Not Guilty on all counts. He feels as does his attorney that his case is strong, because the man that died had threatened him during the argument, and he was exercising his right to defend himself with deadly force, which is legal in State X. His assault and battery charge is also defensible because of this. The drunk and disorderly is defensible because he was in a bar, drinking, and didn't get disorderly until he was assaulted.
The prosecution now has to decide. Do we take this to trial, call witnesses from the bar, forensics from the lab on the bar stool, the kill shot, the tox levels of alcohol, do we test for presence of other chemicals that may have made things worse, etc etc.
Or do we offer a plea bargain. The attorney general's office commands the prosecutor to offer a plea bargain. Plead Guilty to Manslaughter, and the other charges will be dropped, and we will recommend at your sentencing 5 years, parole in 1 + time served.
Man accepts this bargain, enters his plea of Guilty at the arraignment to Manslaughter, and the State drops all remaining charges. At the sentencing, 3 weeks later, he is sentenced to 5 years, eligible for parole in 1 year, and his sentence term is technically already underway, as he's been in jail since the incident several weeks prior.
Now obviously I skipped some steps for simplicity sake, such as bail hearing, or the fines involved in these charges. The point is, the State Attorney Generals of the US don't want to take EVERY CASE to trial. It's a drain on the taxpayers, it's unnecessary, and it can in some circumstances lead to fewer convictions. In this example, the guy was guilty. He killed the other dude, justified or not, protected by law, or not. He did it. And he'll now go to jail for it. But not for 40 years, lol. Nor should he! He was drunk, it was an accident, he meant to knock him out, he didn't know the guy had a soft spot on his head that got hit in -just- the right way, when coupled with his poor health would lead to fatal aneurysm. And he's not getting off "scot-free" either, he is going to jail, and he'll now have a permanent record and a conviction of a felony. In other words, he's learned his lesson, paid his debt to society, and all without a long drawn out expensive and potentially risky trial.