Rocks don't have moral agency. And the comment they replied to I think was clearly about the blameworthiness of the bad actor. So I guess problem I'm having is

Rocks don't have moral agency. And the comment they replied to I think was clearly about the blameworthiness of the bad actor. So I guess problem I'm having is with the equivocation between cause-and-effect responsibility and moral responsibility, which I think was exploited here to indulge in a fun little switcheroo by talking about something they didn't mean.