BERLIN — In a coordinated campaign across 14 states, the German police on Tuesday raided the homes of 36 people accused of hateful postings over social media, including threats, coercion and incitement to racism. ... The raids come as Germans are debating the draft of a new social media law aimed at cracking down on hate speech, a measure that an array of experts said was unconstitutional at a parliamentary hearing on Monday. ... According to Mr. Mihr, Germany’s current instruments for persecuting hate speech, as demonstrated by Tuesday’s raids, are working. “The raid shows that we don’t need this...