When you hear that thousands of writers have signed a petition, you can already guess what they are calling for: What other than boycotting Israel could generate such enthusiasm among the literati?A staggering 6,000 writers and publishing professionals have signed a letter to address “the most profound moral, political and cultural crisis of the 21st century.” They are calling for a boycott of Israeli cultural institutions. The letter says that these institutions have played a crucial role in “normalizing … injustices” and that cooperating with them harms Palestinians—the implication being…