Earlier quoted context omitted.
It's being drummed up to "the ship was in distress and this is illegal under maritime law" absolutely everywhere that I've seen. Like this post. The "Ship in Distress" part of "Mark Zuckerberg's Yacht Refused to Help Ship in Distress" in the display text here is inaccurate, in a legally-significant way. (Was this the original headline text? I don't see any evidence of it, at least) Or comments here, e.g. https://news…
Clearly, the tone comes because the accused weren't guilty of the alleged crime (as you rightfully pointed out), and saying someone's behavior is expected to be bad isn't defending them. The parent comment is just edgy pontification.
Yes, "it's expected" isn't always a defense, but your implication is wrong: More often than not, it is a defense (the most common format is "why are you surprised?"), and that applies here (otherwise, it makes no semantic sense in the parent's comment).
Regardless, why resort to petty insults? It hurts to see this on HN.