For the love of Hanuman, THIS. It's not just that a circular firing squad is unhelpful at this moment; it's also that academics of all people ought to be open-minded about ways of knowing other than their own and ought to be respectful of expertise.
As a meta-point in the academia discourse of today, it's a strange time for professors to dismiss the value of entire disciplines. That plays perfectly for those who want to wreck higher education (and who happen to have a lot of governmental power right now).