"But whether it's with the ubiquity of these SWAT raids, stop-and-frisk, or the default geared-up, Robocop response to political protest, the relationship between police and the public on the whole is growing increasingly antagonistic -- and oddly, this comes during a period when both crime and on-duty police deaths are at historic lows." Author seems to completely miss the possibility that this is causal. Edit: Just…
But that's not what the thesis of the sentence you quoted above is. The thesis is "it is odd that the relationship between police and the public on the whole is growing increasingly antagonistic." For that relationship to be casual, that would mean that lower crime and higher police survival rates are due to the practice of responding to illegal poker games among retirees at the Elks Lodge with the same degree of force as they'd use to take down an international drug cartel.