We don't believe in corruption of blood here in America. Each person is an individual, no matter what family they come from.
Thus, you have situations like Peter Hitchens as a conservative, with his brother Christopher Hitchens being a liberal.
I don't know much about Ari Emanuel, but one thing I do know is that being born into a given family certainly doesn't make anyone intrinsically good or evil...
Vote Trump!
But isn't there enough in his background that you'd be careful about entrusting him with any responsibilities?
There's bad pre-judging or prejudice that says "He must be evil," and benign necessary pre-judging that says, "Whatever he's like as a person, his associations mean we shouldn't trust him too much with anything important."