The group was against the Nazis for many reasons. The Nazis had tried/ attempted to either put all of the Jews in a concentration camp or to kill them all. They had caused the Jews a lot of problems and for them to go into hiding.
Sicknesses throughout that time has caused a lot of deaths and a depression throughout the society. They didn't have medicines so if you were to get sick back than you'd end up dying. It also caused deaths to become frequent and a smaller population.
Anne and Dussel didn't argue frequently but when they did it was over the table. They each felt that they deserved the table time and would argue a lot over who had gotten to use it.