Answer:
The long-term isolation and the situations that the Franks (and the other Jews present in hiding) was very limiting, stressful and they did not know when it would end. They also live in constant fear of being discovered, which increases everyone's stress and facilitates tensions between them.
We can learn from Anne Frank to have hope and patience.
No one is 100% bad or 100% good, so we can say that people are good at heart, even if their kindness is directed to just one thing.
Explanation:
As shown in the question above, the Franks were hiding with other Jews during the second world war, trying to escape the holocaust. However, in order not to be discovered, they could not leave the hiding place, open the windows and make absolutely no noise, so they spent the whole day sitting and communicating little and whispering. Furthermore, they did not know when this situation would end, if it would end and if they would be discovered.
The whole situation was very stressful and terrifying, which made everyone anxious and stressed, facilitating the development of tensions and conflicts between them.
Even with all this, Anne Frank remained hopeful and patient that it would all be over. She was saddened by the situation, but hoped that the kindness of people's hearts existed and would resolve it all.
As the human being is a relative being in feeling, we can affirm that the goodness of people's hearts is real, but in different sizes and directed to different things.