In the early days and hours after the horrific Hamas attack on Israeli civilians on Oct. 7, President Joe Biden spoke with stark declarations and unqualified support for the longtime U.S. ally. Now, a month on, that unambiguous backing has given way to the complexities and haunting casualties of the war, and the Biden administration is imploring Israel to rein in some of its tactics to ease civilian suffering in Gaza. As condemnation of the conflict has grown around the world, stoking anti-Israel sentiment, the Democratic president is also confronting the limits of the U.S. ability to direct the outcome...