I'm not accusing you of anything. When I wrote > The "don't roll your own crypto" is simply wrong in general then I meant the negation of > The "don't roll

I'm not accusing you of anything. When I wrote > The "don't roll your own crypto" is simply wrong in general then I meant the negation of > The "don't roll your own crypto" is true in general I should have used the much clearer > The "don't roll your own crypto" is not always correct I differentiate between "A is not true" and "not(A) is true". The latter I use when the negation of A is a tautology, the former I use when A may or may not be true. In the case of "A is wrong in general" this led to "A is wrong in general" -> "A is not true in general" -> "not(A is true in general)" -> "not(A is true in all cases)" -> "There are cases where not(A) is true".