Unfortunately not everyone has the same sense of duty and the respect for life. Since "these bad apples" don't get punished anyway, and since the system is evidently useless from removing them from ranks, one alternative is to hurt them where it really hurts them, their wallet. I don't know of this will push the half-dirty in police forces to go all the way to the dark side since they will feel that society owes them and they need to make up for the reduction on their disposable income.