Some OS developers are sufficiently concerned that CPUs are NSA-modified to not trust, say, Intel's rdrand instruction anymore!
It may very well be that every single Linux system running on a recent or semi-recent CPU has a rdrand instruction returning a number "nullyfying" (from the NSA's point of view) the previous entropy sources XOR'ing.
You may call me "paranoid" but... Many people who were categorized as paranoids years ago turned out actually to be very, very far from the truth and not anywhere near paranoid enough.
I also remember a SNAFU years ago where a Windows version was compiled with some symbols left on and people started noticing variable named things like: "NSA_KEY". And, of course, lots of PR ensued and there was nothing to see and there were very reasonable explanation as to why there were NSA specific things in Windows.
Contrarily to you I believe it is very likely that most Windows and Apple OSes are backdoored by the NSA and I believe it's far from impossible that several piece of hardware are also backdoored.
I also think it's not impossible that several network cards have "kill switches" where a certain packet combination bricks the card . There have been weird reports out there from people seeing really strange things making such a possibility not science-fiction.
