Actually speaking as a road rider for 40+ years. I also know what works for me. Allowing a car to pass on a blind curve endangers me and one or potentially two cars. That said, nobody rides the white line better than me. I will absolutely let cars pass when safe. I would rather risk a pissed off driver on a blind curve than consider the deadly alternative. We need to be diplomats but also assertive when it comes to safety. It pisses me off seeing riders two abreast refusing to single up and let cars pass when appropriate.