This isn't how it works. Nobody can take points that you would get from your position on the list, and being the only person on the list doesn't give you points for other persons on the list.He was mad because even if you did just 10 percent of the total damage and got looting rights, you would still get 50 percent of the points.
Here are some examples...
A Ghoul is worth 100 points.
Bob, Joe, and Bill all attack and kill the ghoul and based on their damage dealt to the ghoul, the damage they received from the ghoul, and the damage they healed on each other that was caused by the ghoul the "top attacker" list wound up like this,
Joe - gets 15 points
Bill - gets 13 points
Bob - gets 11 points
Now let's assume that for the next ghoul Bill went to make a sandwich and Joe and Bob are the only ones left. Their top attacker and point distribution would look like this,
Bob - 15 points
Joe - 13 points
Finally, Joe has to go to bed because he has to be somewhere in the morning and Bill is still making his sandwich (it's a grilled cheese, which takes some time and you have to watch it because if you don't it'll burn). When Bob kills the next ghoul the top attacker list and point distribution looks like this,
Bob - 15 points