That way, instead of feeling like the world is unjust, you can feel like there are popular misconceptions which you can simultaneously profit from (when Goldman's price drops because it's overpaying employees) and alleviate (Goldman drops when you short it; the bank whose shares you buy goes up).
And of course, you get a boost to your argument. It's going to sound less like "I resent people who can make more money than me," and more like "I think there's an economic inefficiency here -- and I'm prepared to stake money on whether or not I'm right."