Oh, the great Bruce Schneier says so, so therefore it must be. How do you know he's not a shill for Microsoft and the NSA? Hmm?
The great thing about backdoors is, when they get discovered they have perfect plausible deniability. "Oh that key named NSAKEY isn't for the NSA it's for...uh...this other agency. Yeah that's it! It's not even a key. Right Bruce? Right?!"
They are an eco-friendly CO_2 emission reducing measure to reduce workload, in a desperate attempt to comply with KIOTO. They needed it to conform to the Energy Star certification scheme from the DoE.