So the Sandra Bland dashcam video can be filed directly under "Exactly What I Expected." Take a look here if you haven't seen it yet. Shockingly, the narrative the police pushed bears no relation to what's on the video. There's a half-decent chance this cop will end up fired, but that doesn't really help the person who's dead now.
There are two things every law enforcement officer in this country needs to have explained to them before they work another minute. First, we are not obligated to kiss your asses or be nice to you. There is a good chance that if we're dealing with you, our day has been or is about to be ruined. Assuming we didn't decide to murder someone or rob a liquor store that day, it's likely that you're about to hassle us over some minor infraction – 7 mph over the limit…my god, I'm history's greatest monster! – and hand us a ticket we can't afford now that local governments have decided in the face of declining budgets that law enforcement is an alternate form of tax collection. We understand that there's nothing to be gained by being rude, which is why most of use are curt but not aggressive when dealing with whatever crap you are about to subject us to. We are legally obligated to do very little – to provide identification, not to be violent, to comply with the handful of things you're allowed to ask us to do when we interact. That's it. Nobody cares if your feelings are hurt or if your ego reacts poorly to being treated with an attitude other than meek deference.
Second, we don't have to do things just because you tell us to do them. Whether we smoke a cigarette while sitting in our own car is not under your purview. We don't have to get out of the car when you repeatedly refuse to tell us why we've been detained. There is no law that states that we have to stop doing anything that you might be irritated by or that somehow displeases you. This includes smoking, talking on a cell phone while not driving, and being a black person who doesn't act like a 1930s Hollywood Step-n-Fechit toward anyone with a badge.
Oh, and if we refuse to do something that the law does obligate us to do, that doesn't mean you get to shoot us. That's what the law says. In practice, though, "All that matters is the cop had his feelings hurt and Sandra Bland is dead because she wasn’t nice enough to him." Pretty much sums it up, and unfortunately it happens so regularly now that people are getting numb to it.