ah, one of those 'why' people
I don't mean that as snark. Sadly, you want a miracle, but they only have answers they can guess at. Psychology isn't a solid science. You are lucky when you can get two to agree under the best of circumstances. Why don't all psychopaths murder? While others can go on to be driven serial murders. Research offers hints, but fail to find the key to unlock many mysteries. We can land on the moon, but have not found the secrets to 'why' mankind is different in many things.
My own personal belief, the answer is in an old book, evil roams the earth. We each play a part in it every day in some way. What we see in the worst isn't understandable to some. Yet, we chose to excuse away our own little violations daily. Even tell ourselves offenses, our own voids are no big deal. To sociopaths / psychopaths, its the same thing! They have their own denials and voids. To them it is as unimportant as the 'mean' stuff we excuse away each day for our own behaviors. You can't understand their voids, and they don't understand what you think is a big deal. Just like you might shrug off curt words, a catty deed, an 'offense' to someone you perceive as not likable with excuses for being 'mean'. They they are just like us! The same types of excuses and shrugs--- but on a higher degree.
Simple version: I could ask why. Why did you snip that person off. You answer, because they bug me. So, was your perception really a just cause to be mean? Why did you feel you could excuse being mean? Did you really want to hurt another human being? Did you ever spend time plotting to show them, get even or such behaviors? Now magnify it and you have a peek into their world.
If you haven't watched an old movie named "The Bad Seed" you haven't met the real Jodi Arias.