You are running into these people's enclosed space. They have cut themselves off. It literally is a box. (well, sphere; enclosed, reflective into itself)

After a certain point down the emotional scale, it just becomes all self destructive. And often destructive of all those around them.

The narcissist isn't born a narcissist. They are created. In a narcissist's world, they are perfect. They have to be, else they can't withstand all of the emotions that would sweep in and crush them. So, everything that they do is reflected out. "You made me cut you. If only you had let me see my child, this wouldn't have happened to you." Hurt people, hurt people.

There was some good spell-ing for sin that I can't remember.
But, basically sin is the spiritual equivalent of placing your hand on a hot stove.
"Though shalt not touch the stove"

The Christian Bible has many sins spelled out in it. And also, they have many man made guidelines, rules, and good advice not to kill yourself added in, piggy backing on the word 'sin'. Things like not eating pork. Which is good advice if you are a dessert nomad tribe without refrigeration, but not a sin.

There are many who can see auras. And these auras show many signs of damage. Causing of that damage is what I call a sin. Things like killing someone really hurts you. Even if it was done in self defense. Because truly, that is another you out there. You understand that cutting off your arm is a bad thing to do, but most do not recognize that is what you are doing with other people.

So, good is expanding your bubble and evil is shrinking your bubble.
The more evil a person gets the less able they are to accept that they are doing it. They keep lashing out, but the bubble reflects all back into them. This is why, in counselling, you have to get to the person to accept responsibility for their actions. And then want to change. Else, nothing good will come of the counselling sessions.