I'm with you all the way on this, screwtape. While I've no doubt that there are still cops out there that want to do the right thing and who make an effort to police in acceptable ways, it appears that belligerence and various rights violations are on the upswing in many areas and, as trends go, this one sucks. Toss in standard levels of ineptness, actual incompetence, various prejudices, etc. and when combined with an constant exhibition of militarism, and things go downhill fast.
While the reasons for this change are multitudinous, one of the contributing factors is the fact that police departments around the country keep getting free military surplus hardware to help them fend off terrorism and/or anything the fucking feel like fending off. Add to that the incentive to find drug dealers (and if need be, frame a few folks) because the departments get to keep seized property, and the results will surely qualify as recipes for disaster.
I haven't checked the links yet, but I've run across a variety of articles and videos, etc. in recent times on the same subject, and just like every pressing matter in our society (crumbling infrastructure, economic imbalances, global warming, etc), it is a crisis already, with more of the same promised on a daily basis. And of course more guns won't help. That just incentivizes the bad ones to be badder.
The only solution may be to get rid of all possible sources of trouble. Which of course means getting rid of all humans. Barring that, we may just have to agree to not get along.