it's not that they work hard on Wall St., it's the "special skills" they bring to the table. They're so brilliant, nobody can do their job, not even rocket scientists. and if you tax them more, they'll just throw up their hands and stop doing the valuable work they do for society, and we'll all starve.
they will go be ditch diggers or bricklayers instead because they like hard work so much, and be fine making minimum wage doing it, because that is then the fair value of their labor, and they're very concerned with ensuring econ 101 theories are true in real life.
or so I understand from reading this thread.
check
this out.