Thunderous blasts and towering fireballs from Iranian missiles streaking across Gulf states vindicated their leaders’ long-held fears that Tehran can bring war to their doorstep, likely to harden Arab rulers’ support for US-Israeli strikes. Even in The Palm, Dubai’s swankiest resort, explosions rattled buildings and hit a luxury hotel, sending panicked residents running for cover as missiles and interceptors tore across the sky. Dubai’s landmark Burj Al Arab hotel and the airport, which...