We have one a couple posts up who vows to ignore distress calls from sailors he deems less worthy, so there is at least one. Max Hardberger in his “nonfictional” book bragged about ignoring a vessel in distress, so maybe 2?
Just remembered, there was a sad case of a boat being run over by a ship near New Zealand, only the wife escaped, the husband and kids drowned. The ship came back, looked at her swimming, and took off. I can’t recall if they ever got caught, but she did survive to tell the tale. Up to 3 now?