You should read these posts on the topic:

What did the German Jews do to make Hitler believe they lost world war one? by /u/kieslowskifan

Why was Hitler so obsessed with killing the Jews when it seems like a completely different issue than conquering Europe. by /u/depanneur

Why did Hitler hate the Jews so much and Did Hitler actually harbor a personal hatred for Jews, or was his anti-Semitism more a political expedient? by /u/commiespaceinvader