The Hamas attack on key US ally Israel has caused emotions to run high in a place better known for the steely exercise of power — the White House. President Joe Biden has given several strongly worded speeches pledging support for Israel since Saturday’s assault by the Palestinian militant group, and at one point pounded on a lectern to make his point. Emotion got the better of a senior White House official who choked up on live television as he discussed the attacks. Biden’s national security advisor admitted the crisis was “personal for us.” The unusually open displays reflect deep...