Just a couple of comments. I read the entire original post. Two things stuck out in my mind.
First off, the officer chewing him out. I am not a child and the officer is not my parent. No officer has ever chewed me out and I would not tolerate it if they did so. I certainly would not argue with them right then, I am not stupid, however my next action after the officer left would be to call his supervisor. If I violate a law, I expect to be ticketed or arrested as appropriate but I will not be chewed out as if I am a child. If possible I will have that officer fired.
I am not "cop-bashing" here. I will not tolerate that behavior from any other adult, period. My boss, my real boss (my wife), no one. My boss can take appropriate disciplinary action, write me up, fire me, whatever but he does not have the right to chew me out. My wife can get mad and yell at me but not as if I were a child (fine line there).
Secondly, if someone is following me, that is a threat to my safety as far as I am concerned. Driving aggressively, non aggresive, I don't care. As far as I am concerned when they start following me then they are acting aggressively. If I am able to positively identify them as police then I will stop and ask them just exactly what they think they are doing. If I cannot then I will do what I consider necessary to stop this aggressive behavior. We do have anti-stalking laws for this very reason. I do not know what their intentions are.
As far as Devonai's story being true or not, innocent until proven guilty. I assume his story is true. That said, I also try to never second guess the commander on site. Sound familiar? Some of the suggestions were sensible as to what he had done some were patently silly. Would I stop at a red light with someone obviously following me? No way on God's green earth. In the same situation I can easily see myself making dumb moves.
As far as knowing the mindset of the officer or what police policies are, I don't know and I really don't care. The policies were put into place because of violations by police officers and to protect citizens and the officers themselves. Officers are trained to handle dangerous situations, citizens are not. Officers are trained in the law, citizens are not. To protect and serve the public is their job and duty. This officer messed up. He knew he was in a POV without lights or siren, common sense says he should have called for backup in a police cruiser. That's exactly why they are clearly marked and have lights and sirens. That's also why we now have a law here in GA that says you don't have to stop for an unmarked police car.