Arming the Syrian rebels would be “pressing weapons into the hands of maniacs and Al-Qaeda thugs,” London’s mayor has warned. His is the latest call in a wave of rhetoric urging the UK prime minister not to provide the Syrian rebels with weapons. Writing for British publication The Telegraph, Boris Johnson wrote that the UK must not use Syria as “an arena for muscle flexing.” “We can’t use Syria as an arena for geopolitical point-scoring or muscle-flexing, and we won’t get a ceasefire by pressing weapons into the hands of maniacs,” wrote Johnson. He joins a number of prominent British...