Why does C++ not allow inherited friendship?

Question

Why is friendship not at least optionally inheritable in C++? I understand transitivity and reflexivity being forbidden for obvious reasons (I say this only to head off sim

Answer 1

A guess: If a class declares some other class/function as a friend, it's because that second entity needs privileged access to the first. What use is there in granting the second entity privileged access to an arbitrary number of classes derived from the first?