The principle of jury nullification is not contrary to law or rules. John Jay, the 1st Chief Justice of the supreme court, in 1789, wrote, "The jury has a right to judge both the law as well as the fact in controversy."
In
Marbury vs. Madison, the ruling of the supreme court said, "All laws which are repugnant to the Constitution are null and void."
In,
U.S. vs. Dougherty, the supreme court held, "The pages of history shine on instances of the jury's exercise of its prerogative to disregard instructions of the judge."
I would like to see the precise wording of the oath that you reference. Which laws must we follow? Which rules? It is already clear that federal laws and rules conflict in many cases. Are oath-bound to treat the judge sitting in that particular court as infallible? Or do the federal judges merely provide instructions and make suggestions during the course of jury selection and the trial that they must ignore reality and truth in order to come to the verdict desired by the government?
I truly doubt that voting to acquit a defendant because the convicting him would violate law or justice would be to break the oath. It is inconceivable to me that federal courts require an oath that is, on its face, immoral. Can you tell me what the actual oath is?
This is from Wikipedia:
In the United States, a federal juror's oath usually states something to the effect of, "Do you and each of you solemnly swear that you will well and truly try and a true deliverance make between the United States and ______, the defendant at the bar, and a true verdict render according to the evidence, so help you God?"
Jury instructions sometimes make reference to the juror's oath. For example, the Criminal Pattern Jury Instructions developed by the U.S. Court of Appeals for the 10th Circuit for use by U.S. District Courts state:
"You, as jurors, are the judges of the facts. But in determining what actually happened–that is, in reaching your decision as to the facts–it is your sworn duty to follow all of the rules of law as I explain them to you.
"You have no right to disregard or give special attention to any one instruction, or to question the wisdom or correctness of any rule I may state to you. You must not substitute or follow your own notion or opinion as to what the law is or ought to be. It is your duty to apply the law as I explain it to you, regardless of the consequences. However, you should not read into these instructions, or anything else I may have said or done, any suggestion as to what your verdict should be. That is entirely up to you.
It is also your duty to base your verdict solely upon the evidence, without prejudice or sympathy. That was the promise you made and the oath you took."
If Wikipedia is correct, then clearly one could vote to acquit because the evidence clearly shows the a conviction would not be just. The judge's instructions shown above make a lot of claims, but clearly it is intended to intimidate not elucidate.
I couldn't find any other specific quote of a federal juror's oath on the internet.