Originally Posted by Top_Cat
In that particular instance, the extra run isn't penalising that fielder, though; it's penalising the peanut(s) who wasn't/weren't backing up the throw.
So it's the backing-up fielder's fault if the ball deflects off at a 90 degree angle? I don't think so...
I agree with mundaneyogi - players aren't rewarded for good cricket in that instance.