The real reason lies behind 500 years of German Lutheran antisemitism. Germans (like Muslims today) were brainwashed into hating Jews by 500 years of having heard Marthin Luther's racist and false claims against the Jews (after he pretended Jews recognize him as a new Moses, something to which they absolutely said no as they did with Mohammed, another false pretender). We mustn't forget that, before Nazism rise to power, Germany had the highest number of Nobel laureates in the world, and the worldwide leader in scientific research. The persecution of the jews caused a real disaster in Germany, a disaster from which Germany (or Europe for that matter), never recovered.