It is difficult to continue this conversation productively because the nature of your claim is such that you will not want to give examples to back it up or to clarify what you mean.

There are lots of areas where I can give examples of stuff that used to be unmentionable in academia, such as the frequent revisions of the history of the Soviet Union.

Which examples imply that there is lots of stuff that is still unmentionable in academia - and what is unmentionable in academia is for the most part unmentionable on LW.