Part of the answer is that in 1930's Europe, lots of people didn't need to hear evidence about how bad the Jews were, they already disliked Jews for other reasons. This was true not just in Germany, but in France and lots of other European countries.

So when the Nazi propaganda machine started churning out manifestos blaming Germany's national problems on Jews, and dramatic films confirming many widely-held and very old stereotypes about Jewish people's inherent wickedness or otherness, people were likely to believe it.

hi! there's room for more input, but fyi, I rounded up these posts last week for a similar question re Hitler; you may find them useful

Some context

• I've read that Hitler blamed jews largely for Germany surrendering WWI. What precisely did he think they did?

• It's common knowledge that Hitler blamed Jews for Germany's problems in the early 1900s. I'm curious about the specifics of this blame and how Hitler managed to convince so many people of the Jews' 'fault'.

• Why did Hitler hate the Jews to the level where mass extermination seemed ideal to him?

• Was the antisemitic sentiment in WWII Germany due mostly to Hitler? Or was there already a culture of antisemitism growing beforehand? Was Germany already heading toward a Holocaust, or was it entirely inspired by Hitler?

• even broader context in this FAQ section Jewish Stereotypes and Persecution Throughout History

a closer look at Hitler himself

• Why did Hitler want to remove Jewish people from the world?

• did hitler ever right out say why he wanted to kill all the jews?

• Was Hitler an Anti-Semite?