Comment by jessaustin

Plausible deniability? "How could we have known the flaw was exploited by NSA and FBI? We didn't know about the flaw at all!" When, actually, it was designed by NSA, before they created CF as an attack vector. Eventually the vuln is discovered as was inevitable, but because the caches were theoretically "public" no one notices all the drone strikes and parallel constructions correlated with CF use.

I don't actually believe that, but it isn't an unreasonable theory.