I've seen a great many people angrily denouncing those who defend Roman Polanski. What I actually haven't seen is a lot of defense of Roman Polanski. As this article points out, the "Hollywood elites" have pretty much declined to sign on to the two petitions making the rounds and supported primarily by foreign filmmakers.
I have no interest in defending Polanski, although if I were back in Crim Law I'd expect to have to argue both sides of this under the Model Penal Code, Utilitarian Theory, and Retributive Theory (most folks angrily denouncing the factesque support of Polanski plainly fall into the Retributive camp. The case under utilitarian theory is a bit less straightforward, but still fairly easy. And it's been so long since I've looked at the MPC I no longer remember the substantive arguments).
I'm all for Polanski doing the time for the crime and for his spending years evading his sentence. I just don't feel the need to get angry or feel superior to an imaginary mob of non-existent defenders.