All of this is distorted because its focus is limited to self. It has difficulty understanding the needs of any one outside itself. The hard shell is hard to see through. Initially, as we have said through changing your focus. Then you allow the heart to become angry at anything that conflicts with what it feels it thinks, needs or wants.
Anger is an excellent way to distort reality.
But Abel brought fat portions from some of the firstborn of his flock. The LORD looked with favor on Abel and his offering, but on Cain and his offering he did not look with favor. So Cain was very angry , and his face was downcast. Everyone has had the misfortune of having to deal with an angry person. I am sure that many have had the misfortune of dealing with each of us in our anger.