Zuckerberg and facebook are just lobbying for government to take responsibility for the things that they, as civilians, and Facebook as a public corporation are responsible for – not screwing up so many people's lives that the aggregate turns into a societal problem. The intention here is to create legal precedent as a shield against future prosecution. If the government mandates that only it is powerful enough to stop these problems, then how could we have stopped them?!
This is when you sue, hard.