Consider an action with benefits but also large costs. If a proponent of the action doesn’t feel conflicted and grapple with the costs, that’s evidence that they don’t appreciate the costs and thus don’t have an informed view on the action. (And even if the action is basically correct, the version of the action they endorse likely isn’t the optimal version; they probably won’t do a good job of minimizing the costs.) The absent attitude is called a “missing mood,” from Bryan Caplan’s The Missing Moods. There can also be missing moods other than not appreciating costs, and the same concept applies to incorrect moods that are present — Caplan’s examples include pacifists sympathizing with evil regimes and libertarians sneering at the poor.