Sort of funny the author is praising the cops for not abandoning a statue, as if that were vital. But no, I think it's just Trump playing up for optics (sort of funny to use the DHS, that entire agency's genesis was that) so look hard and be all about "law and order", as ironic as that is for him. And as I said, large chunks of society really enjoy uniformed grunts roughing people up. Doubt these federal agents are really going to do much of anything meaningful, maybe rough up some protesters as cops usually do - ignore the guys throwing bricks and go beat up some skinny dude with a sign.
Are the police materially abandoned by city officials ? Lack of them chanting some equivalent of "blue lives matter" is irrelevant, cops' ego's being fragile aside. The city government hasn't been onside with cutting the cop budget, with the defunding fuss and over the years have steadily increased it. Which makes sense given the violence level in parts of the city - though suppose you can make the argument they are getting poor ROI on that