Nobody thinks we should ban firefighters no matter how widespread rampant racism might be among them. I'm not saying it is. But we all agree that even the most horrible firefighter on the job is better than letting fires do their thing unchecked.
I certainly disagree. The worst firefighters cause a lack of trust in a profession that depends on such a thing deeply. No firefighters would be preferable than firefighters who burn your neighbour's house down while trying to get a kitten out of a tree. Or routinely run over people at a prolific rate whilst doing their routine day to day jobs. And be completely immune to oversight or consequences. There are enough innocent law abiding Americans who just don't feel safe around law enforcement. Call me insane, but personally I think that is a big fucking problem.