1. This (re: citizens violating classified laws or legal interpretations) is definitely a situation where any sane judge/jury would find against the ignorantia juris non excusat principle, so I don't expect the use of any of this to hold up in any court, ever, not just because its effects are potentially unconstitutional. And any judge worth the wood upon which they sit would dismiss any evidence presented that has been gathered as a result in that it wasn't obtained with a legal warrant, or in any manner that is constitutional.
2. This is massive amounts of ammunition for conspiracy theorists, especially truthers. Let me give it a try: 9/11 was an inside job, orchestrated by the US government under the Bush administration as a false flag operation in order to to get the Patriot Act passed with plans to classify interpretations which would give the government over-reaching powers to violate the constitutional rights of citizens to the point of being able to create a Stasi state.
3. Why don't we demand impeachment if Obama re-authorizes any part of the Patriot Act, obviously knowing about classified secret interpretations which have already been found to be unconstitutional (re: classified findings)? The congress has the ability to decide whether or not the President has committed a "high crime", and I'm fairly certain this fits the historical meaning of that term.. knowingly and willingly violating the constitutional rights of every US citizen, a constitution which the president is sworn to defend (https://en.wikipedia.org/wiki/Oath_of_office_of_the_Presiden...).