Answer:
overgeneralizing a culture as a whole
Step-by-step explanation:
Milgram's research tries to prove that some people have traits that make them more vulnerable towards obeying authority. Therefore based on this information we can say that David's argument is weak since he is overgeneralizing a culture as a whole and is not providing specific detail as to why exactly they chose to follow Hitler's orders. Mostly since it is known that not all Germans were in favor of Hitler's reign at that time.