MIAMI — Miami Mayor Francis Suarez held a rare news conference outside the Miami Police Department headquarters Wednesday morning amid swirling allegations of corruption, ethics violations and other scandals casting shadows over nearly every office in City Hall, including his own. When he took to the lectern, however, he did not address the near-daily negative headlines coming out about the government he leads, but rather to give a speech touting statistics suggesting a drop in Miami’s violent crime rate. Before the event began, the mayor’s communications director, Stephanie Severino, warned r…