Let's pretend that the problem with cops really is "just a few bad apples" like cop supporters continually insist.
What does an apple seller do with any bad apples he discovers in a barrel of apples?
Does the apple salesman make excuses for the bad apple and leave it in the barrel?
Does he remove it for a couple of weeks, then sneak it back in when no one is looking?
If he does toss it out, do other apple sellers enthusiastically come get it and put it in their barrel?
Do the other apples crowd around to protect the bad apple from being disposed of?
What happens if you leave bad apples in the barrel with the good apples?
Will the bad apples be made good again by exposure to the good apples, or will the bad apples ruin the whole barrel?
What are police departments doing with all the bad apples that keep turning up?
Are police departments disposing of the bad apples that expose themselves?
But, you might point out: people aren't fruit.
You're right. People aren't rotten fruit to be thrown in the compost heap. So why do cop supporters keep insisting on making that comparison?