"Fairness" in a capitalist system is more or less what you can get while following the laws. In this respect collective bargaining/unions are fair. They may go against the grain of American individualism, but they're fair.
The guy running the injection molding machine wasn't overpaid. The market had simply set a new price on his expertise. It went from $15 or $20 bucks an hour to 50 or 75 cents an hour. That's a conversation I wouldn't relish having with anyone. "Hey pal, the thing you spent the last decade doing for eight hours a day -- the job that has paid the mortgage, fed the kids and makes you a hero to your family -- is now worth five bucks a day."
The hedge fund guys are just the latest thing. Twenty years ago it was the M&A guys and the arbitrageurs (love that word). And before that it was the go-go years brokers, who followed the bond brokers...