What did Anne Frank mean when she wrote that "the little man" is just as responsible for the start of World War II as the politicians?

One of the more striking things about Anne Franks diary is
how, for a very young girl, she seems so mature and wise.  Maybe it's the contrast with
the hardships and cruelties of wartime Holland taking place around her family's hiding
place.

When she places equal blame on "the little man" for
the start of World War II, she is talking about the average citizen of Germany, France
or Britain who elected and often supported leaders who would allow such a catastrophe to
happen.  Mostly, she is talking about the German people, who elected Nazis to power in
the Reichstag, and did little to oppose Hitler's war or the Holocaust against the
Jews.

It's one of the moments in the book, one of many,
where she seems wise beyond her years, and one of the reasons why her diary in
particular is still so widely read and taught.