I'm not saying we can't upset conservatives. I helped fight for gay marriage for many years, and I'm sure I upsetted many conservatives along the way. Some conservatives are upset at any change anyway. But if we act according to the (classical) liberal, live and let live social contract that underpins all Western liberal democracies, we remain 'reasonable' in the eyes of most people, and they will listen to what we have to say. It is much better than taking an adversarial attitude to mainstream society by default.