Susan Estrich:

For the past 30 years, Roman Polanski has been not just a convicted rapist but a fugitive from justice.
Yes, he’s made some big films in those years. So what?
Yes, he’s traveled freely across Europe during those years, living a very fancy and famous life without being arrested. So what?
There is no statute of limitations on fugitives.
The fact that he got away with it this long is not a reason to declare him innocent. He is a guilty man who fled from justice. It is time, past time, that he was returned.