We have not, to date, had any difficulty in interpreting the DFSG as
applied to documentation, excluding the lunatic fringe who appear,
stick their oar in, and cease to send mail when somebody points out
why their argument is flawed (in every discussion, not just licensing
ones).
In all the FDL debates, there has not once been a solid argument that
it is actually acceptable, which was not immediately rebutted. If
anybody thinks otherwise, they are invited to present their argument
*and then defend it in the face of skilled opposition*.