The wealthy elites that now own and control everything that matters in this country have been grooming the police forces all around the country to be their personal 'good squads' for several decades, just as the police were back in the days of the 'robber barons' (a time very much like today). Which is why they have been arming them to the teeth with military weapons and equipment, and training them to use exceptionally violent tactics. Not to mention it's good for business selling all that stuff to the government at wildly inflated prices. They know that sooner or later the American people are going to wake up and realize that they have been totally bamboozled, robbed, and enslaved by a rigged economic system, and by a corrupted political system that have been designed and controlled by the rich, for the rich, and at the cost of everyone else's life, liberty, and happiness. And when we do, we will be looking for some heads to roll.
And that's when the wealthy elites will need their goon squads and their crooked judges to protect them. And more importantly, to protect their economic interests. The real question will be the military, itself. Will they do the bidding of the wealthy elites, against their own fellow citizens (and family members) when some corrupt president demands it? Or will they act to protect the citizens of this country from their own co-opted and corrupted police forces and politicians? I fear that we will find out sooner rather than later.