How is a silly portrayal at all equivalent to insinuating someone murdered (or caused the death of) their friend?

Besides, there is a higher level of protection from libel in the US as a private person vs a public figure.

Matt Damon is good friends with Trey Parker and Matt Stone, and the only reason they made him like that is because the doll maker messed up on Damon's doll and he looked like a dunce.

Satire is protected speech.

Making a movie "based on the Amanda Knox story" and then implying she was involved in the murder is not clearly satirical. Comment higher up says she doesn't have a case, but I honestly don't understand how this wouldn't be libel/slander.