I don't POD kill. There is no money in it so its worthless to do it.
There's no curage in doing it so its cowardly to do it. There's no skill in doing it so there's no improving. Those who POD kill get, no rewards, no benefits of any kind.
However they do gain the fact they are possible making money for the game maker when people spend real money to get ISK to replace implants.
Also killing capsules helps the player get back to base faster. This give them a better chance in returing with a better ship and friends.
Not killing the Capsule forces then to return the slow way giving you a better chance to move on or set up another attack.