Reading Mein Kampf, I came across a paragraph about the Jews that gave me some hope.
(Jews)There were few Jews in Linz. In the course of the centuries their outward appearance had become Europeanized and had taken on a human look; in fact, I even took them for Germans. The absurdity of this idea did not dawn on me because I saw no distinguishing feature but the strange religion. The fact that they had, as I believed, been persecuted on this account sometimes almost turned my distaste at unfavourable remarks about them into horror.
What Adolf is saying is that he initially saw the Jews as people who were the same as him, but who just happened to have a different religion. That he almost felt horror whenever people would say bad things about them simply for being a little bit different. So.... how many people do you know who cringe or feel horror whenever someone makes "unfavourable remarks" about the Jews or the lesser races? How many people are there that think the Jews and the lesser races are regular everyday people, no different than you or I, who just happen to have a different religion or skin color? Keep showing them the truth and they will come around just like Adolf did.
Keep spreading the truth. And never stop. Even Adolf initially imagined the Jews as being regular people, and felt horror when people told the truth about them. If you keep spreading the truth, people will come around. Just like Adolf eventually came around and accepted the truth.
Maybe the person you expose the truth to will become the great leader that will unite us all. Don't stop, and don't lose hope.
