If you lived in a cave and your roommate came home late with the meal you were dying to eat you wouldn’t have the comfort to be angry. Those who live in a small town who have only one doctor must live and let live with that professional even if they lack a bedside manner. Yet, because you don’t literally “need” that individual for your heart to beat you can stay angry with them for as long as you want which might give you some comfort except for what it might do inside. Outside it can result in goals being pulled apart from the seams as we focus on that emotion instead of what we originally had on our screen. While inside the long term, anger can rot our system resulting in high blood pressure, depression and heart problems which could cause strokes or heart attacks. So maybe in a sense we still live in a cave when it concerns that heated emotion?