Frequently here at Lost in Criterion we bring up the "death of the author" with a few different understandings, but ultimately they all boil down to this: one can, and often must, separate a piece of art and the artist responsible for it. It is possible to admire a work even if the creator did something reprehensible.
That being said, while Roman Polanski did a terrible thing, he also created a fairly terrible movie. Knife in the Water has a few things going for it, principally the technical prowess of filming on the small yacht and the political climate it was made in. But it's just not that good. And I really wanted to get through this whole episode without even mentioning that the man is a child rapist, but then I watched an interview with him and read a relevant portion of his biography, learning about how he found star Jolanta Umecka while "scouting" at a local swimming pool and how Polanski spent the shoot trying to keep her from eating, and from there I realized that Roman Polanski has a terrible view of women that infects everything he does. So that terrible thing is brought up, because its relevant. So, trigger warning, because we briefly discuss the rape of a 13 year old girl in this episode.