Maybe I'm just a skeptic, but I have a hard time believing things went down like you said they did. There is pretty much always more to the story than people tell, especially when trying to make a point.
I'm a social worker who has hears roughly 100 bs stories from clients about what wonderful, innocent people they are. Example of what I have to deal with:
Mom - "You had no rights to take my kids from me!"
Me - "Ma'am, you were passed out with a needle in your arm and your 5 year old is making supper for your 1 year old when we came to your house and apprehended them."
I also work with cops on a regular basis as part of the job, so perhaps there is some bias. Yes, there are some bad cops here and there, but the vast majority are decent, hard working people who genuinely care about the safety and well being of their community.
If things went down like you explained, that's brutal and there is no excuse for it.