They were unthrustworthy. They butchered 60 000 german civilians and that's what started the whole war. Hitler hated noone. I wish he did, but he was too good for his own good. He paid dearly for that - kindness is never left unpunished.
Frederick II of Prussia treated Poles with contempt, in particular the gentry, the numerous Polish nobility.
The king considered West Prussia uncivilized and compared the Poles to the Iroquois. His long-term goal was to oust Poles through Germanization, which included the appropriation of lands of the Polish crown and monasteries, the introduction of military conscription, encouraging the settlement of Germans in the region, and the implementation of tax policies that disproportionately impoverished Polish nobles.
Some of Bismarck's statements about the Poles:
"My long-term observations and experience show that for Poles, conspiracies and political intrigues are not just a fundamental need." Bismarck argued that Poles have exceptional talent and natural skill in this area, which, being in the service of the Polish national idea, will never find peace and will stimulate new unrest.
"Poles will always remain unreliable and ungrateful subjects" — despite the fact that they live much better in Prussia than anywhere else.
"Bismarck also considered ingratitude and selfishness to be traits of the Polish national character."
Bismarck considered the Polish aristocracy and clergy to be particularly dangerous, who, in his view, were the bearers of the Polish national idea and therefore posed a particular danger.
Bismarck's most famous words about Poles are lines from his letter to his sister: "Beat the Poles to death; I sympathize with their situation, but if we want to preserve ourselves, we have no choice but to eradicate them."