Democrats and Republicans aren't actually against each other, they pretend to be two different parties as it is an effective psy-op to keep the populace believing in a Reformist path to change, so we do not pursue a Revolutionary path instead. As long as the populace continues to believe a Reformist path (like voting) is able to save them, the Capitalists can continue doing what ever they want, only Revolution can save us (IE we must save ourselves by overthrowing the Capitalists), and only once the people in general realize this, can Revolution actually succeed. It is also why we must keep pointing out to people how the system is rigged against us, how as long as we live in Capitalism Democracy is a lie and the oppression and exploitation and U.S. bombings will continue.
ILikeToMeow
In Capitalist countries authority is used to oppress the masses and protect exploitation, in Socialist countries it is used to oppress the Capitalists (who don't just disappear the second the revolution succeeds), the CIA invented "Authoritarian" as a way of demonizing Socialist countries by drawing attention to how it suppresses the class enemy of the working class rather then who is suppressed and for who's benefit. A State is needed for as long as class antagonism exists, which itself will exist as long as class itself exists, which itself will exist so long as the material conditions for classes exist, which will exist until global communism is achieved. Until then, a State is needed to protect the success of the revolution, which is "Authoritarian", along with your brain telling your body to get up in the morning, the bullet from a gun used against fascists who do the same to you, or even missiles used to deter the U.S. from bombing the shit out of you which they have done before and would do again. TL:DR "Authoritarianism" isn't a thing.
Just to be clear, Cops being bad is not an inherent property of them in and of itself, but rather Cops serve the State, and in a Capitalist country, the State serves Capital, and so the Cops also serve Capital, but in a Socialist country, such as China, the Cops are completely different as the State actually serves the interest of the overall masses, and so the Cops also by extension.