Binney came before Snowden and he raised all these issues and it didn't really sway the public. That was pretty frustrating. He didn't bring a database with him so naturally some assumed he was making stuff up because he was bitter his system was being used and deployed under a different compartment and he was sort of not part of it.
One interesting thing here is that it really undermines the often repeated PR phrase "Oh why didn't Snowden just come to us (higher ups) and tell us. There was no need to go public like that". The implication is "we could have listened and fixed the problem".
Here is Binney years before trying to do that. Yes he didn't go directly to his bosses, I think it was clear they wouldn't have listened. He went to Intelligence Commetee (Congress). Went to DOJ. Nothing happened. Some anemic 90% redacted reports. "Vows to take to be more careful in the future", nonsense like that.
All it ended with was FBI raids and persecution for those involved.
The crucial part comes at the end and that is Snowden studied their case and he made sure to take documents out with him.