On Wednesday, America's Vice President Joe Biden will arrive in Turkey. His main mission is to smooth things over with Turkish President Recep Tayyip Erdogan, who is getting angrier with the United States by the day. The reason Erdogan is so angry with the United States is, Erdogan says, that America still provides a safe haven to Islamic scholar Fethullah Gülen, who Ankara accuses of being behind the failed military coup on July 15. Both before, but especially after the coup, the Turkish government has accused Gülen, who lives in Pennsylvania, of being a terrorist leader comparable to ISIS self-declared...