In general, sure. However, you cannot possibly assert that the specific PRISM program, or the extent to which it was unlawfully used against the American public (and our allies) was known. This is pertinent information that Snowden has revealed to the public, don’t you think?
How was it unlawfully used against the American public?
Again, not a trick question. I would like to know.
My point is that Snowden revealed details useful to our enemies but nothing novel.
Your statement is consistent with my contention.