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The Miranda warning is a constraint on government. The government is contrained to provide due process and not violate a person's right to self incrimination: that includes torture, but it also includes taking advantage of people. If somebody can't be deemed to have been able to make an informed decision the presumption is that they're taken advantage of. So they're reminded of their rights; if they're judged to not understand their rights, to have been abused so that they gave up their rights under duress, or were possibly ignorant of their rights, the courts have recourse.
The Miranda warning lets the courts know that the right of non self incrimination was preserved at the defendent's glottis or before.
If the Miranda warning wasn't issued it may be they didn't understand their rights; if they're mentally challenged and didn't understand their rights; if they were under duress; then the courts preserve the right to non-self-incrimination at the jurors' tympanic membranes. In other words, they are not allowed to consider evidence that that came from a violation of due process or is presumed to result from due process.
The Miranda warning was imposed on the courts to preserve the courts' integrity wrt the Constitution and preservation of rights. This is utterly distinct from the concept of justice, because a person who killed 20 people, left no incriminating evidence, freaked out and confessed prior to being Mirandized and who later pleads ignorance of his rights can have his confession tossed out. No incriminating evidence, no punishment. That's not justice, that's rights. Sometimes a violation of rights is justice (unless we merely define justice as "what the letter of the law says"--something most object to in most settings, but lawyers often swear by, unless they need to argue otherwise).
The Miranda warning is issued by police in order to preserve the integrity of the testimony, so that they won't be punished by having the testimony and any evidence resulting from the testimony thrown out at court. Even Holder said that at least one reason that Abdulmutallab was Mirandized was to preserve the integrity of his statements at court. If you have unimpeachable, independently obtained evidence, screw Miranda--but be aware that nothing that the suspect says is likely to be acceptable to the courts. But if you don't intend to use his statements or evidence obtained resulting from the, the matter is irrelevant.
So, you tell me: Is this the value "society" places on justice or based on the nature of the offense? IMO, neither. Police want to stop the bad guy, courts want to uphold civil liberties. Often "society" objects strongly to the latter, and has little to say directly about the former.
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