While I don't spend my time sweating the NSA,
Yes, I'm comfortable with the opinion that the NSA isn't trying to steal people's bitcoins.
I'm more worried about the rogue sysadmin at a mobile carrier that has access to sneak in a few lines of code into an official update, unbeknownst to all until the bitcoins are swiped. Discussed here:
Can a mobile be protected against the Linode problem? http://bitcoin.stackexchange.com/q/3383