Well,

Hitler HAD written clearly about that 'Jewish Problem' long before he started to gain real power, but he actually started on the mentally feeble, the morally feeble (homosexuals), then moved on to political enemies, communists, ministers of religion (but since he had a deal with the pope, he left HIS boyos alone, mostly, allowing him to work on the pope's enemies, the Lutherans!) gypsies, and lots of other groups. The Jews were a good popular target too - for there was ALREADY much resentment against them, fomented by the Christian Churches over centuries, and as the war machine wound up and the country fell more strongly under political control, it became much easier to dispose quietly (without public fuss) of the large numbers of that ethnic and religious group too.

I have always felt empathy for that large ethnic/religious group, but have begun to feel increasing annoyance at the 'political takeover' of the massacre as 'just against the Jews'. That's rewriting history too!