This is related, in a way, to my previous post: After reading yet another invitation-disinvitation story, I think every university should – in the interests of full disclosure, honesty, and charity – prepare a list of Topics On Which Dissent Is Not Permitted and send that list to everyone who is invited to speak. That way prospective lecturers will know in advance whether they hold views that are not tolerated at those universities and can decline the invitation immediately rather than having to be canceled later on.