I am grateful to Jason for spotting this quote, translated from this German text of 19.10.41, also noted in Herf.
Mauer reports massive shootings of Jews in the Ukraine.
He urgently requests explanatory material for the Ukrainian population because they don't understand the need for such severe measures against the Jews.
Bolshevism has weakened the anti-Semitic instinct in the people of the Soviet Union; in many ways we'll have to start from the beginning here.