Not wanting to take a principle to heart is not the same thing as denying that's the way things work, though. I think most people acknowledge (or at least give lip service) that being able to be objective is virtuous and often important. Even the ones who are rubbish at actually being so in real life.

And of course it's entirely possible to be blatantly one-sided about capital punishment, but still want to hear both sides of the story when your kids are having an argument.

And of course it's also entirely possible to realise you should be objective, even if that's more difficult and disturbing and less satisfying. You can just grit your teeth and tell your need for one-sidedness to shut up and let you think properly.