If I am going to the bother of compiling the binaries, why would I not simply use them, as in Gentoo? If I did either, could I be confident that nothing was missed in my code examination? What about the compiler, the linker, and so on? If I compared results to the distributor's, how would I decide whether a difference indicated a fault in the distributed binary, the source, or simply noise introduced by differences in the two Make environments?
The question ultimately resolves to one of trust: how far shall I trust the kernel and other developers, knowing that they are fallible and conceivably corruptible humans not all that different from me? Should I reckon them more or less trustworthy than those of Microsoft, Apple, or Google? Why?
For that matter, why should I consider as The Guardian, Spiegel, The New York Times, the Washington Post, or even The Register more trustworthy than the US and UK governments and their accomplices in Canada, Australia and New Zealand? I have little personal knowledge of any of them, and all of them, whether government or press, may have motives for shading or spinning the truth. The documents I have seen are worrisome for sure, but are open to a range of interpretations not all of which support a claim that the governments are much interested in imposing a totalitarian regime. But are these documents to be considered trustworthy as given, inasmuch as they have an unverified history that depends on the questionable trustworthiness of a single individual?