Einstein was not good at what it took to build a bomb. He did write a famous paper with the relation between energy and mass but that is theory work. And that is where his contribution in the nuclear physics stopped. He was a cosmologist for the most part, not a nuclear scientist or engineer for that matter.
The myth of the Heisenberg sabotage was only presented in a single book that has since been refuted. He did not sabotage the program, he made a mistake. After the bomb on Hiroshima he made the calculations again and made another mistake, and only in the third time he got them right. And Heisenberg was not a Jew, he actually was a German nationalist (his words) although not a Nazi. He did want to build it, Army did not want it as it would take too long and they estimated that the war would be over faster. Heisenberg even wanted to bring Bohr to work with his team - that is how the word got out in the first place as the Bohr was the main guy in that field at the time and everyone was in contact with him, including the USA scientists.
Einstein could not know for himself about the bomb project he wrote the president about, as he left 6 years before it. He was told about it by his European friends.
But even if Germany allocated the resources from missile project to the bomb project and got the bomb by 1943 (they started in 1939, three years before the USA), it would not change a thing. By that time the Germany was losing the war and two or three nukes would not change a thing even if Germany could throw them.
And he could not focus on the bomb before the war in order to have more of them, simply because the fission was only discovered in 1938 and the results were published in 1939. So a few months later the project started... so did the war.
So, in retrospect, his treatment of certain populations did nothing to influence the creation of the nuclear bomb. The only reason Germany did not finish it is because A) the army did not want to fund it (they could, missile project cost as much as Manhattan project) and B) German team made a few mistakes that they did not have the time nor the incentive to fix. From the 1939, almost from the start, the German bomb was doomed and the project continued more or less on the theoretical basis for the future after the war. The army thought the war would end soon, it was only one more push, one more attack and the enemy will break, so the nuke never got the attention it needed. In the end, both missile project and nuclear bomb project were useless to Germany (those resources would be much better spent on more factories and mines) but a huge thing after the war for others who got their hands on their tech.
You should conquer the world first and build fancy things for it later
