Of course übermenschen exists.
Some people are just made out of a stronger fiber than others.
Competency, nerves, intelligence, will, endurance, valor.
I have never fallen for the illusion that all men are equal. That's bullshit.
However, it is the duty of the strong to protect the weak, the man with good eyesight to lead the blind.
What Hitler did was really freaking stupid and evil.
In my experience, jews as a culture tend to be, if anything, more competent, persistent and full of spirit than most other people.