Decpite Hitler hating Jewish people he wasnt the first and only one. Around 1353 Jewish people got blammed for what was the plague epidemic and they were also acuused of poisning the wells.
It is still not clear of why Hitler hated them. It is said however that he is ashamed of his partly Jewish roots. It is belived that Hitlers grandfather was Jewish.
Hitler could have contructed his hatred for Jews because they were the cause for when he got attacked with mustard gas. Or Hitler could have contracted a venereal disease from a Jewish prostitute. There are still no facts to prove this is why.