There are plenty of theories on why Hitler hated Jews so much. One of the most popular theories and possibly the closest one to the answer is that Hitler is simply a racial extremist.
To him, Germans are the superior master race, the Aryans. Let’s begin with a quick history lesson on the Nazi party efforts for the racial dominance. On February 24, 1920, when the Nazi party was first started as the German Worker’s Party, they declare ruling based on racism in the first public meeting, as their political agenda, devised by Hitler himself. Racial purity is demanded in German, that it is their fate one day to rule over the inferior races. These inferior races include the Roma and African blood, but especially harsh on the Jews, claiming them to the poisonous. His issue of the party “25 Point Program” specifically stated that “No jew, therefore, may be a member of the Nation.”
On 18th July of 1925, Hitler found himself in prison, for treason after his failed power seize of 1923. That gave him enough time to think and wrote the infamous Mein Kampf. The mind of the madman was outlined in the document, his racial ideas that saw all the world’s problems through the history as the conflict between the various races over sovereignty. Thus, the antisemitic envisage a conquest of the world, the Slavic to be enslaved by the Germans, then the annihilation of the Jews. No one is sure of where his hatred over Jews exactly came from; many historians portray him to have lived a life of being overshadowed by the Jews. It became his mission to remove all the Jews from Germany.