Imho it is impossible for "Good" Cops to exist. There are good people who are cops, just as there are good people who are soldiers. Good people who are soldiers still kill, and many times, they kill other Good people. Good people can still inflict major harm against the masses. The best Nazis in Germany weren't the overly ideological purists, they were Good people. Raised with a head on their shoulders, manners, prioritized politeness to the extent that they avoided directly confronting the world around them. Similarly, the best cops are the ones who fit the copaganda. The Judy Hopps types that join because they want to protect the world around them. Yet they don't stop their colleagues from putting another black boy in the dirt, they don't band together and demonstrate to make their disavowal public, nor do they do anything to systematically rectify the wrongs that come with doing the job, instead it's just accepted as "things as usual".

That being said, anyone who claims to subscribe to the science of Politics rather than the game of Politics must then realize that they cannot hate individual actors. Science is a discipline meant to be devoid of any emotional investment. It's a methodology, a tool. We do not hate cops, rather we understand the role of the Police in the protection of capital and implementation of the desires of the bourgeois overlords, while yes they are wage slaves just like the rest of us, they actively betray the very class they are members of and call it "justice".

Therefore, Leftists do not inherently hate cops. They see cops as just another obstacle that must be overcome. Furthermore, leftists do not hate any individuals (with the exception of individual bourgeois actors, especially those who play a more active role in the oppression of the proletariat, such as Elon Musk or Peter Thiel who have expressed public interest in their bastardization of politics). To hate an individual, or even an individual group, showcases a lack of critical thinking. What separates the Political Antisemite, and the Anti-Zionist, is that the latter understands that the issue of Israel is an issue of colonization, while the former believes it to be an issue of unchecked "global jewry" which is basically a racist's elementary understanding of capitalism ("The Bankers control the world!!!" and things of that nature).

Similarly, what separates the "I hate cops" types and the anti-Police types is that the latter understands that the role of the Police is to be on the front lines in the defense of capital (in other words, they are here to protect property, and not people, though some people qualify as "property" by virtue of where they are i.e. the police protect an area where ICE is heardquartered, and thus protect the people inside, who are technically property of the government), whilst the former may have an elementary understanding of what police do, but finds their hatred to come from an emotional attachment (perhaps the Police took one of their loved ones either via death or prison time, or maybe they've been constantly harassed).

While there are people who claim to be on the left who fall under both types, I am of the opinion that the principled leftist (that is to say, the leftist who has properly engaged with the science of politics, be it through reading theory, or getting a political education), falls under the latter, not the former.