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Penner has a good idea. Instead of implying that "they broke the law" use some Shakespearean irony on them and let it be known that they wouldn't break the law because they are all honorable men but if they didn't break any laws why do they need amnesty and immunity from prosecution for laws that they didn't break.
They can't have it both ways. If they didn't break the law then they have no need for amnesty/immunity. If they must have amnesty/immunity it is a tacit admission that they broke the law.