I'll try then to explain this without the old cliche .
If you take a polecat by the throat, holding him while you blast him away with a 12 guage shotgun, you will kill the polecat.
However, you may also have blown off a few fingers and made one hell of a stinking mess. You then demand of your friends that they are expected to help clean up after your action.
In retrospect, you have killed the damn polecat, but the cost was high in fingers and friends and the woods are still full of polecats. Now what do you do. To continue to kill polecats using this tried and proven method may not be the best plan. Anyone short of a total idiot would search for another way.