Because TrueCrypt is several orders of magnitude more high-profile of a target (being actual cryptography instead of a compiler) and probably also several orders of magnitude easier to compromise in a useful fashion & spread.
Paranoia is without bound. Who knows, you yourself might be a sleeper agent and you just don't know it yet! Maybe your eyes really were compromised in development! So you approach the problem from the point of view of what is likely, and what is not. You cannot guard against every single paranoia, but you can guard against ones you deem more likely.
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Why not?
Because TrueCrypt is several orders of magnitude more high-profile of a target (being actual cryptography instead of a compiler) and probably also several orders of magnitude easier to compromise in a useful fashion & spread.
Paranoia is without bound. Who knows, you yourself might be a sleeper agent and you just don't know it yet! Maybe your eyes really were compromised in development! So you approach the problem from the point of view of what is likely, and what is not. You cannot guard against every single paranoia, but you can guard against ones you deem more likely.