This seems to be the motive for all moral relativists:
Because if you can convince me, then suddenly your beliefs become more real. Right?
The more people you can get to jump on your…train, the more your mission is made. So until you get me to swallow your world and believe what you believe, you’ll never have the kind of faith you want to have. You’ll always have a little bit of doubt. You’ll never know if you’re quite right. You’ll always kind of be wondering if it’s real.
— from the movie, Henry Poole Is Here (a film I highly, highly recommend)