Below is a recent photo from Washington University posted on Facebook.
Notice all the participants wearing COVID face masks. The COVID pandemic is long over and more than a year ago, the Cochran study found no evidence that face masks are effective to prevent spread of COVID.
What do these face masks have to do with Middle East politics? Nothing. What do totally unnecessary post-pandemic face masks have to do with tribalism? Everything. The masks serve as badges of in-group membership. They function the same way that fancy suits do for trial lawyers and executives. The same way that buying pre-torn jeans serve for young women or that wearing ashes on foreheads serve as badges of group belonging to Catholics. For more than 100 posts on Ingroup-Outgroup dynamics at this website, click here.