This December has been Spain’s worst month for gender-based violence in 20 years, with 13 women being killed in the span of 28 days and a further case still being investigated by police. At least six of the incidents happened after complaints had already been filed. Spain’s government has grown increasingly concerned by the worsening situation — indeed, the highest number of gender-based murders since records began in 2003. The country’s interior minister, Fernando Grande-Marlaska, has expressed his “deep frustration” at the “unusual and terrible proliferation” of such crimes and has ordered …