Wilbur Ross is an investor in manufacturing company's, primarily automotive supply. He's made his billions by acquiring majority share in several manufacturing sectors.
I don't think he bailed out Trump, but may have been a business partner on some ventures. He certainly is not as rich as Trump is. Trump likes to hire winners.
If he is working at the commerce department its because he understands business like Trump; he's not a politician. He made of learned the trade working at Rothschild but Rothschild didn't make him rich.
It's like saying everyone who worked for Goldman Sachs was evil. Some people quit and move on when they find the company they work for is not ethical. I think Ross probably did the same.