The NSA doesn't need to know a backdoor exists in order to worry about one. The ME is infrequently exercised code with a large attack surface and highly privile

The NSA doesn't need to know a backdoor exists in order to worry about one. The ME is infrequently exercised code with a large attack surface and highly privileged access. If you are security conscious and don't need the functionality it's quite logical to want to turn it off, whether you're the NSA or anybody else.