AFAIK in most countries the plea bargain is not allowed as it is considered a violation of the accused's civil rights as well as a violation of justice.
Civil rights because of the inherent asymmetry of power (violation of the Geneva convention on torture since you're getting a confession, whether legitimate or not, under threat of force).
Violation of justice because if the person is found based on the evidence to be guilty then they should get the appropriate sentence; if not they should not. In theory the plea bargain is "clemency for taking responsibility and admitting guilt" -- in practice it of course is not. And someone who pleads guilty without a prior agreement will be at a disadvantage, again leading one to believe that the plea bargain case is for the innocent.
Civil rights because of the inherent asymmetry of power (violation of the Geneva convention on torture since you're getting a confession, whether legitimate or not, under threat of force).
Violation of justice because if the person is found based on the evidence to be guilty then they should get the appropriate sentence; if not they should not. In theory the plea bargain is "clemency for taking responsibility and admitting guilt" -- in practice it of course is not. And someone who pleads guilty without a prior agreement will be at a disadvantage, again leading one to believe that the plea bargain case is for the innocent.