I'm sorry that happened to you and your brother. I assume this happened many years ago, but if it is within 20 years, the officers are likely still working in that same department. Ever check on them to see if they are still there?
As was mentioned earlier, no one wants bad officers to leave the profession more than good officers. Do good officers sometimes to bad things? You betcha. Do bad officers do good things? Occasionally. It isn't like there is a schedule that decides whether an individual officer will be bad or good on any given week, shift, call. Sometimes while in the pursuit of a good end, bad decisions are made and innocent people are hurt. That is what your situation sounds like to me.
When you say that every interaction you have ever had with law enforcement has been negative, I don't know how many interactions you are writing about, but often when I look a problem, I try to remove variables to isolate the source of the problem. If a person has 100 encounters with 100 different police officers. If all 100 of those negative encounters involving 100 different police officers are under different circumstances, how likely is the probability that the person encountered 100 different bad police officers on 100 different occasions? I hope you can see where I'm going with this.
I've said this to my kids, and I've said it to people I've supervised; most of life is about mental attitude. You have no control over the mental attitude of others but when you focus, you should have control over your own attitude. You can allow people to push your buttons and get from you what they want, or you can choose how you want to react or not to others. Your choice. We all are responsible for our actions. We all have choices on what we do.
Be safe.

