A strong sense of justice is... delicate.
I don't mean it breaks easily, but the opposite: you have to deal with it no matter what. A person with a strong enough sense of justice is unable to forget (they can forgive, but forgetting is less likely) an offense committed against them.
Very often we are also unable to forget an injustice we have committed.
Your brain jumping from a demon to the next like it took parkour way more seriously than your body doesn't mean it wants to torture you: sometimes it just wants to tell you something - send you a message that you don't seem to understand no matter what it tries.
To me, these intuitive leaps usually mean that I have damage to repair. That damage, no matter how much I'd like it to be, is not mine but a weight inflicted upon other people. By me.
If I ever cared about you, seeing you happy and comfortable is easily the thing that makes me the happiest in this world. That is the energy I want for myself and those around me. It is not easy sometimes. It is always worth it, but not always easy.
Seeing someone you have hurt massively being happy is like being stabbed in the chest, but not for the intuitive obvious reason. It doesn't irritate me or make me angry to see that person happy - the total opposite, it feels amazing. The stab comes right after. "If this person is living their life, happy and surrounded by loved ones, even after all you did, how much happier could they be if you hadn't hurt them? How beautiful moments have you taken away from them?"
With the perspective of the years, it is difficult to calibrate how much of all that happens is a consequence, direct or indirect, of our actions, but that doesn't mean the consequences are not there, it just means we can't see them.
If I was a religious person, I could see this mental process as a penance, God showing me the scale of the damage I caused in the form of other person getting rid of the weight of my actions. I am not a religious person, but it could be me sending this message to myself: what I want to see and process is exactly that, the person has spent rowing a time that, without the damage I inflicted upon them, they could have spent living a happier life. Maybe they're stronger now, but they shouldn't have to, and that's my fault.
A man at university once said "A calm conscience is a symptom of bad memory". I will die defending that the guy was drunk, but maybe this type of reflection over my bad deeds is the form in which my brain wants to get over and live with them, starting with the first step: recognizing the damage done.
The second is without a doubt apologizing to the person. Here is where time really enters the equation: not everyone faces their demons in the same way, some situations require you to forget so that your brain can keep living - and forcing the person in question to remember them doesn't feel fair.
I've been looking for this word the entire text: a strong sense of justice is terrifying.