An Experiment That's Been Tried Already
Theodore Dalrymple explains, in an over 20 year old article, why the left inevitably hates the police:
Their function is, after all, to defend the social order: and since the social order is widely held to be responsible for the poverty of the poor, it follows that the police are in part responsible for that poverty. They are a part, not of the criminal justice system, but of the social injustice system. The intellectual never acknowledges how much of his liberty he owes to the existence of the police—a humiliating thought, to which he prefers the idea that the comparative peace and tranquility in which he lives, and that make his work possible, emerge spontaneously from the goodwill of his fellow men...