[ContrarianBrit]

Thanks - these are valid points. I'm going to revise this part of the article. But I still think that this is a problem. See for example,

https://www.ucu.org.uk/media/8614/Academic-Freedom-in-the-UK...

https://source.wustl.edu/2020/08/free-speech-nearly-half-of-...

[blacksqr]

The study at your first link seems to have similar problems to the CSPI paper linked in the original post: email solicitation, self-selected replies, low response rates.

[ContrarianBrit]

Thanks - I'll also look at this.