i love conspiracy theories, gives me something to think about.
There seems to be overwhelming evidence that people at the NSA have deliberately weakened cryptography several times so that encrypted material would be available them.
Is there any question about this?
The question really is if they can weaken SHA256 so much that they are able to break the encryption or render BTC useless. There are a lot of mathematical geniuses in the world and the incentive has never been higher to find a loop hole in those encryptions.