I've never seen a Captain, retired or otherwise, go out of their way to be abusive. I don't want to use a blanket excuse such as "they deserved it", or "they knew what they were doing / getting themselves into". But, sometimes, that is the case.
Looking from the outside in on what a Captain in game does can look very damning. What's likely is that the Captain has a good reason for lethaling, jailing, increasing someone's ticket, or even leaving them restrained for 10 minutes.
Just a day or two ago, I drove a suspect back from a bank robbery. If you were on the outside of the situation, you would've seen me simply drive back to HQ, and throw him in jail without saying a word to him. In reality, he was screaming his lungs out in vehicle chat, and I'm absolutely not going to process that.
We've been on these servers long enough, 2013 btw, to have a rapport with almost everyone who has stuck around on these servers. We recognize your name and your past interactions with us. If we know someone to be toxic, troll us, bar gate us, etc, we'll give you a shorter leash. There are ways to get attention from the police that doesn't require us to dislike you for it.
While the solution isn't as simple as "Be nicer to the police", it would go a long way to correcting the issues you're bringing up, @Sean That Irish Guy. If you report an officer who's treating you like shit, and the video shows him treating you like shit, but you are also treating him like shit, it devalues your report. If you report a cop being an asshole for no reason, he'll have guaranteed action taken. The way I used to handle reports on officers boiled down to a couple of factors. Was the officer acting negatively as a reaction, did he make a mistake, or was he being malicious. Only two of those deserve punishment, and one needs a lot of context.
Sort of rambling, but if you don't give an officer a reason to mistreat you, he'll eventually get himself demoted/removed.
I can't speak for the spawning stuff in, or lethaling someone to not have to drive them back.