Actually I had the misfortune to have a few interactions with cops, although yes, I an upstanding citizen (IMHO
). At present, to date, my only "crimes" have been driving related, specifically speeding several times, unsafe driving, which technically I could have fought, but $800 to fight, and risk losing, or $250 to pay up, illegal u-turn, failure to yield, and of course a bunch of parking tickets.
I've been through several stops where no ticket was issued, and several checkpoints.
So no, unfortunately I have had quite a few interactions with cops. You're right, on the street they are top dog. That doesn't mean you have to roll over and play dead though. Many cops will take that as an invitation to just walk all over you... tried that appeasement approach. No thank you.
Better to hold your ground, legally speaking, without being aggressive. Only questions you actually have to answer on the street, are your name, and address. You do not even have to produce an ID unless you are driving. If you are driving, yes, you do have to produce a license, registration and insurance.
The kid was absolutely right there was no reason for him to roll down the window further, and neither did he have to.
You say, Q: "well, why didn't he just roll the window down if he has nothing to hide?"
A: Because the cop can say he sees something suspicious in the car. ANYTHING, and even imaginary. By leaving the window open you invite the cop to stick his head inside, and take a good look around, giving him an excellent option to find something that looks odd.
You'll note the cop even tried to just open the door... smart on the kids part to have the doors locked.
Q: Ok IE, let somebody be in your face yelling at you and recording you. Lets see how long you take it before you punch the guy.
Pacing back and forth like a lunatic and yelling and recording during some kind of stand off is considered antagonistic in my book.
A: If this is in a public space, or he is doing this from a public space, I would have no choice but to deal with it, or go somewhere else myself. This is what reporters do, and should be able to do. It may suck to be the target of it, but it's not illegal for someone to wave a camera in front of you, especially so long as they do not do pass into your personal space. If they touch you, that's assault.
If this is in a private location, you can call cops to have the said person removed, or depending on state law (texas for example) you would even be justified in just shooting them.
About finishing the job, idk, I have mixed feeling on the subject. Personally I think I would have finished it, just to make sure the animal doesn't suffer anymore. At the same time I can see why a cop wouldn't want to do that since it would have looked extra cruel, and the dog was already down, no longer having a strict reason to shoot again.
Actually you are looking at it from the wrong perspective. "personally I never gave any of those powers to cops" Probably because you are a stand up citizen and have never had an encounter with a cop. Believe me, if a cop approaches you, you do what he says or your ass is getting the same hospitality as the guy in the vid. The respect and power is given by us by swearing the cop in, on the street it is common knowledge that the cop has the power, right or wrong that is the way it is.
Ok IE, let somebody be in your face yelling at you and recording you. Lets see how long you take it before you punch the guy.
Pacing back and forth like a lunatic and yelling and recording during some kind of stand off is considered antagonistic in my book.
Haha I was just about to write lets not argue but then I realized I had the long rant above... What are your feelings on them not "finishing" the job on the dog? I'm torn as to yes they should have, and no they shouldn't have.
edit... I say yes, because it was clearly in pain, and I say no, just because murphy's law would have that "mercy" bullet ricochet and kill a bystander lol
Michael.
Avery was really cool and had asked if I would like a username. 
