Photo credit: DiasporaEngager (www.DiasporaEngager.com). In one scene from the powerful and horrific documentary “Baltic Truth,” Riga Ghetto survivor Marger Vesterman plays the piano to the tune of a song created in the ghetto. He then recalls what the words were: “If you survive, no one has to remind you that you have responsibilities.” The chilling documentary reminds us that it was not only Nazis who massacred Jews. In this case, Latvians and Lithuanians were all too eager to quench their thirst for Jewish blood, even if it meant shooting neighbors who they’d previously celebrated birthdays with. The searing documentary is...