It is implied that logic indicates superior judgments, but between two people, more often than not, it is simply used as a manipulative ploy. We can't go to the movie tonight because we have to get up early tomorrow. That sounds logical, but from your perspective, missing an hour of sleep won't stop you from getting up early. You'd prefer the new shrubs and the TV, but you'd be quite happy to eliminate the new kitchen table for which you have allocated funds. It is your right to change your mind.
People simply change their minds, and thank goodness they do.
Otherwise, we would be a very rigid society and still be wearing crew cuts and beehive hairdos. What works for us today may not tomorrow. What you liked last year may not fit with the more aware you of today. Or maybe you just got tired of living that lifestyle and changed. Changing your mind is healthy and normal, but other people may resist by challenging your right to do so.