There's like a half dozen other people in the conversation who understand and disagree, and I'm sure if Trunkage understood he'd still disagree. But we're pages into conversation about moral systems by which one my judge an action like abortion and he comes in with the idea that we're talking about hedonism in the sense of "sexually active women are hedonistic", and that was never what anyone was talking about.But he's just so very right that the only reason anyone could tell him that he's wrong is that they just don't understand.
If you want to bring him up to speed yourself, you are welcome to. Or don't if you don't. Just don't degrade the conversation on purpose.