Some cases are more important than others.
In most school systems, the importance of a case is a function of its centrality in some ideological doctrine. We typically teach students cases so they will believe certain things about their country, their religion, or their background. The reason for teaching a case from this learning perspective has to do with whether a case is paradigmatic. However, the reasons a case should be important should not come from ideology but from the case's ability to help students think. The second issue is labeling.