1 in 5 people you meet lack empathy. I got these numbers from reporting the US military made to the office of general accounting. The military gives everyone a psychiatric evaluation. Its the only place to get a accurate number on this. Due to the fact that almost all of them avoid any type of therapy. I can't find the link right now but if I find it later I will post it.
Edit: Here you are. For my not surprising number of doubters. This is where I started when I went down the path toward finding the numbers I'm using. I rarely bookmark anything on my phone as its barely useful when doing anything serious but I bookmarked these pages on it.
https://health.clevelandclinic.org/narcissist-signs https://www.therecoveryvillage.com/mental-health/narcissistic-personality-disorder/npd-statistics/
Its up to all of my detractors here to read through it. Here is a hint if you disagree and get upset reading it you may be one of the people I'm talking about. Not that you will admit it.
If you read this and notice that some of the people around you who cause you pain and stress act and do these things to you. You may be a victim. I encourage you to seek therapy. Those that have this problem will not want you to and try to convince you its not right to do so.
The most common thing they will do is try to scare you and embarrass you. The best thing you can do is not tell them until you have been in therapy for a while. There is no point in arguing with them. They will never admit fault. Its one of their most telling traits. A inability to admit fault and truly apologize. The best they can ever do is feel sorry you feel that way. Not sorry they hurt you but just sorry you hold them accountable for it. That is how they are crippled emotionally.