The point glitch will happen again. The idea of having points being the same lost as gained is so that the only way points can get into the system is when a new player gets an achievement. Therefore the ratio of points to players is always equal and fair. Having 10% gained when donors get killed would cause new points being created, and the point glitch happening again essentially.
Edit: I basically repeated what
Mooclan said. Except it is important to note that while it may be 5-30 points extra per kill, there are hundreds upon hundreds of donors getting kills each day, more than likely 25+ a day. With that in mind, it would take almost no time to increase the amount of points in circulation by the HUNDREDS OF THOUSANDS simply from unconscious players getting kills. It would cause an issue.