What are you trying to accomplish by indexing your trigger finger? Is this a way to discourage accidental shootings by LEOs holding suspects at gun point?

One of our long time competitors and match organizers suggests we point our trigger finger at the target. The goal partly is to help get the handgun pointed at the target but primarily it is to avoid firing a bullet down through your leg. I have won matches using his method. I do not understand how there would be an advantage to feeling for an index point between drawing and firing. Perhaps it would help keep you from sticking your finger through the trigger guard if you fell while running between firing positions. Ayoob's method appears to position your finger so that if it is jolted off the frame during a fall it would be more likely to enter the trigger guard.

Admittedly, since I do not work in either trade, me telling a LEO how to hold his tool would be as nonsensical as me telling a carpenter how to hold his nail gun.