I get what your saying, at first I thought the same thing but when I looked more into it, it makes sense why people are calling for abolition. It's much bigger than most of us even know (and that's on purpose.) The policing system is not broken, it is functioning
exactly how it was meant to function, it has just evolved over time. If the foundation was made bad the whole structure is bound to be bad, you have to start again from scratch right? (Also one analogy doesn't work for every situation) This why police reform doesn't work, the officers know what they are doing, they know how not to shoot first and ask questions later. And body cams are turned off, destroyed, or the footage is not even presented to the public. It just means even more money is going to policing where it can be used much better elsewhere in community development and other more important things. Plus, we are calling for a different system than what we have in place, no just leave a hole. I recommend watching the documentary 13th and reading The New Jim Crow to learn about the history of policing and how it all started with slave patrols.
Many, many articles and stories from about former cops being punished for speaking out and trying to do good here is one:
https://medium.com/@OfcrACab/confessions-of-a-former-bastard-cop-bb14d17bc759)
Also good: