1: No. Even though there was a chance that it could've been Miep, Mr Frank was correct, they must stay hidden, better safe than sorry.
3: No, they aren't. They are just one case of many people who have suffered from Hitler's actions. Hitler targeted the Jewish and other minorities he considered wasn't a "Pure German" They are many cases, such as Eva Pickova (wrote "Fear" while in Terezin, a concentration camp.).
4: Even though Hitler and the Nazis targeted the Jewish and other minorities, they weren't shot on sight since they still had value (eg; working in a work/concentration camp)
5: from running from the nazis when margot was 'recuited', to learning he was the only survior in the family, likely grief.
6; Shows that she didnt finish her diary, her story still lives on in us.
7: the diary brings closure to mr frank, since we see a side of him, a side not many see (besides close people, like anne) (plus he was hidden for many years with his family)
8: because anne was still native to how to world works, and even after dying to typhus (she wouldnt have contracted the sickness if she was safe in her house (not the annexe)) and it puts mr frank to shame because he'll never have a grown adult that understands the world as adults see it, (or because he failed to teach her that the world isnt fair or nice)
I hoped I help :) thank you.