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Whether displayed or not, the points never really contained any useful information about the quality of a post. The ability to dispassionately evaluate an argument solely on the basis of whether it is logically consistent, based upon a reasonable interpretation of fact, and skillfully written without letting your personal biases enter into the evaluation is a skill that most people (sadly) do not possess. The reality is that most people will upvote posts that agree with their own worldview or appeal to their sense of humor and relentlessly downvote any viewpoint they personally disagree with, even when well-presented and logically consistent. Comment points only provide information about what is popular. Groupthink virtually guarantees that the point system is incapable of distinguishing between useless garbage and expressions that are both heretical and true.