Well it turns out that NetNewsWire's javascript confirm() function doesn't actually show a dialog. Instead it just returns false. So if you browsed from the feed to a game and tried to press the resign button not much would happen, as the javascript would behave as if you'd hit the cancel button.
Anyway, changed it to not use javascript for confirmation and instead require you to check a checkbox next to the resign button. That should be sufficient to avoid accidentally clicking on the resign button.