Israel invaded Gaza and waged war for 22 days, in response to Hamas firing a nonstop barrage of rockets over the border and refusing to recognize Israel’s right to exist: 13 Israelis and 1,300 Palestinians died, and more than 50,000 people were left homeless. A tenuous ceasefire is in place, but the hard feelings and questions swirl far from the region. In Europe, thousands marched along the...