The idea that dark triad types tend to wind up in positions of authority, due to them being scheming, machiavellian assholes who do whatever it takes to obtain dominance over others, does carry water.
However, it's once again confession by projection. Even if they're correct about cops being authoritarian assholes (especially in LA of all places), it doesn't change the fact that leftists are just as bad,
for the same exact reasons.
That's not even getting into the fact that ACAB is fucking retarded because they don't necessarily hate the police because they abuse their authority, but because they exercise any authority at all. They're egoists who get angry with ANYONE who stops them from doing whatever they damn well please. They envy the police and wish to hold the power they do.
Whatever alternatives to the police that leftists and ancaps could offer, is inevitably going to be more brutal, more lethal, and less forgiving than the police they replaced. Civilian militias have little incentive or ability to give quarter (as Kyle Rittenhouse implied when he admitted that he had no nonlethal means of defending himself), and there is nothing that prevents an anarchist from acting as judge, jury, and executioner if he damn well feels like it. Anarchists don't believe in due process.
Saul Alinsky once said that the price of a successful attack is a constructive alternative. A constructive alternative is something that leftists are consistently unable to provide.