A physicist and engineer argues that terrorists have not been able to set off a nuclear weapon due to lack of competence, and the speaker discusses the importance of "love" and "sense of justice" in preventing historical catastrophic events.
The Allies' love and sense of justice may have prevented much worse things from happening during World War II, and Hitler is a prime example of the debate between the great man theory and trends and forces theories of history. It's hard to imagine anything worse than what happened, but there were potential candidates in the Weimar Republic who could have made a difference.
The hatred of Jews and anti-Semitism was a tool used by Hitler rather than something he believed in, and without it, World War II may not have happened.
The Hitlerian era saw a huge spike in anti-Semitic conspiracy theories in Germany, with Hitler viewing the Jews as both weak and super powerful at the same time. Despite this, there were Jewish figures who could have potentially sided with the Germans had they not been anti-Semitic.
The more detached from reality and evil a person's thoughts and actions are, the less competent they are at their job. It's possible that the Holocaust may have prevented Germany from getting nuclear weapons first due to the hatred of the Jewish people being a hindrance to their competency.