Hitler wanted not only to eradicate the Jews; he wanted also to destroy Poland and the Soviet Union as states, exterminate their ruling classes, and kill tens of millions of Slavs (Russians, Ukrainians, Belarusians, Poles).
The fourteen million were murdered over the course of only twelve years, between 1933 and 1945, while both Hitler and Stalin were in power.
Communication among citizens depends upon equality. At the same time, equality cannot be achieved without facts.