Thousands of people wearing black clothes braved the torrential rain in Buenos Aires to protest the rape and killing of a 16-year-old girl in Argentina. Protesters called it Black Wednesday, and turned it into a day to demand an end to violence against women nationwide. Lucia Perez was abducted outside her school in Mar del Plata on October 8. She was drugged, repeatedly raped and sodomized with an “unspecified object” so violently that she eventually bled out from her internal injuries. Three suspects have been arrested and are still in custody. The prosecutor on the case, María Isabel Sánchez, told Telam news agency that the assailants washed her body and cleaned her clothing before dropping her off at a local clinic — and running away. “We can all be vulnerable and suffer what happened to this girl — all of us, our entire gender,” said Gergina Elcano, a demonstrator in…