Yes it is true most people only want fair when it suits them. Many years ago I managed retail stores and some of them were unionized. I used to hear "fair" a lot. My favourite was when they sited the collective agreement to make their point about fairness. I used to respond in kind "we can follow the collective agreement to the letter of the law but you told me you can't work weekends and the agreement says you must work every second weekend, so we can work together to come up with an arrangement that works for both of us or just follow what the agreement says is 'fair'".