When did the German people begin to realize that Hitler was not a good guy?

Answer 1

It's not really a matter of realisation. Hitler gained all that power and support because he offered hopes to German people when there were none, through his proposal of the Twenty-five points. And people only realised it when it's too late, because they believed and trust Hitler and worshipped him and thought he had the power to make Germany a stronger country. People just blindly followed him because he offered them hopes and promises. And this is why:

He offered something for every social class of Germans during their worst time (e.g. The Great Depression and he used the horrible living condition under the Weimar government), these social classes includes middle-class and industrialist and business men, working class and even ex-soldiers.

He offered middle-class and industrialist and business men that he will restore the economy of the country, as seen in no. 16 'We demand the creation and support of a healthy middle class', and the middle-class Germans were in no position to refuse an offer like that during the Wall Street Crisis which has cause them to lose their jobs; And on the other hand, Hitler successfully convinced the industrialists and businessmen that in order for them to be wealthy, which is the objective all business men and industries are aiming for, to generate wealth, that in order to do that, they must support his political philosophy and ruling of a totalirianism/Nazi society, in other words, they must live by and obey and accept the Nazi ideology. Here, the business men and industrialist believed in him and worshipped him because they thought he will have to power to achieve their dreams and help them.

Hitler also appealed to the ex-soldiers from WW1 by promising to restore Germany's pride by destroying the Treaty of Versailles, which is something that was shameful for Germany. But the treaty were especially disliked by the soldiers. So why did Germany dislike the treaty so much? Because they lost a lot of their lands and military power, and most importantly, their national pride, because by signing the treaty (although Ebert really had no choice but to sign it...), they automatically admitted to starting the war, and take all the blame for it, when really, the war was triggered by lots of reasons. So, the ex-soldiers supported Hitler because he offered to restore Germany's pride and to correct the damages done by Ebert and Weimar government and the "November criminals".

Many of those who bothered to read Hitler's "Mein Kampf" (published in 1925) realized straight away that Hitler was "not a good guy".