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As for plea bargains, I accept what you say: the judge decides upon the sentence once a crime is proved. But isn't the prosecution then practising some kind of deception on the accused: offering a deal they can only ask for? No, wait. It's surely in the power of the prosecution to offer only sufficient evidence to convict on the lesser charge if they want to, especially in adversarial systems like America's or ours. That makes it perfectly possible for the prosecution to make sure the bargain is honoured.
It's not quite that simple - yes, the prosecution can stop you being convicted on a more serious charge than agreed, but they can't stop you getting a more serious sentence than they recommend. If you were facing murder charges in New York, for example, the sentence can be up to life without parole. Plead guilty to manslaughter instead, and the worst you could get is 25 years with parole after 8 1/3 - but your deal with the DA might also include them recommending that you get 15 year with parole possible after 5. The judge might ignore that recommendation and give a harsher sentence (or indeed a lighter one) - and of course either side can appeal, too - but you're still safe from anything more than 25, thanks to your plea bargain. Of course, your own lawyer would explain all of this to you before you formally accept the deal and enter the guilty plea. (England has slightly different rules: the judge can actually get involved to a limited extent, by indicating the sentence he'd be inclined to impose during the negotiation stage, as I detail on the plea bargaining thread here.)