Do you honestly think the NSA would have replied, "Dang, you're right, these mass spying programs are immoral and illegal! We'll launch an inquiry into ourselves immediately.".
https://intelligence.house.gov/uploadedfiles/snowden_report_...
> “The Committee further found no evidence that Snowden attempted to communicate concerns about the legality or morality of intelligence activities to any officials, senior or otherwise, during his time at either CIA or NSA.”