"As historians, we the undersigned condemn Prof. Peter Singers’ [sic] abhorrent views that some humans have less value than others."

"We object to inviting him to Rhodes College to speak as part of a 'Pandemics Ethics' panel. Positioning him as an expert on ethics only legitimizes his reprehensible beliefs that deny the very humanity of people with disabilities. Hypothetical philosophies on morality cause real violence. We historians are all too familiar with ideas that justify labeling marginalized, vulnerable, and minority populations as 'life unworthy of life,' and the murderous consequences for those deemed 'unfit' to live. Adhering to the College’s own IDEAS Framework that seeks to foster 'a sense of belonging' and embrace 'the full range of psychological, physical, and social difference,' we historians assert that Prof. Peter Singers’ blatant inhumanity has no place in serious academic exchange here at Rhodes."

From a letter by the History faculty and the Anthropology/Sociology/African Studies Program at Rhodes, quoted at Brian Leiter's blog. Leiter's point is that the Philosophy faculty invited Singer, and it's a matter of their academic freedom.