The thing we are all forgetting is that the map is an artificial construct. In the real world there is no "well defined" map edge which I can cross and you can "magically no longer shoot me".
I have always viewed it as an abstraction of "running away". If you do it on your edge of the mapboard - it is relatively safe. If forced to do it off another edge - it is still safe - but you have been forced to leave in a tactically disadvantaged way - and thus your points are halved. Meaning the other pilot fought a better fight.
Running doesn't represent being killed or captured. It is just an abstraction. A skilled pilot will try to keep the battle in the centre of the map - cutting off the escape routes of the enemy pilot.
Just my 2 cents.
Oh, and yeah, I use the above rationalization to run when I need to
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