That's what makes de Blasio's policy vis-a-vis show business so important. Because the mayor is either jettisoning his beliefs in favor of his personal and political gain, or he never really believed this social justice nonsense in the first place.
The fact that it turns out the de Blasio family paid only an 8.3-percent effective tax rate for 2013 only adds fuel to this burning question.
Read MoreThe really rich don't really mind high taxes!?!
Many conservatives may want to take this opportunity to bash leftist Hollywood political cronyism once again, but a better strategy would be to talk the bigger issue of what really causes income inequality and how to fix it. It's important to have this policy debate now because the Left still seems to be doing all the talking on this issue.
Supply siders should agree with the Left that favoritism and unfair policies are the biggest contributors to income inequality and then pound this special treatment for Hollywood as a prime example. Then, the point needs to be made that the only way to really end this kind of favoritism is to completely level the playing field. That means across-the-board tax and regulatory cuts. That means no more outright subsidies. That means fewer opportunities for cronyism and special treatment.
Leave it to the Hollywood Dream Factory to finally invent a storyline where it's the right wingers in America who can finally be the standard bearers for fairness and equality.
This is commentary from Jake Novak, the supervising producer of "Street Signs." Follow him on Twitter