That's part of the non-ideological reason why the ideological approach is so popular. It makes it easy for both teacher and student to feel good. Once the student can parrot a few general talking points and learns how to apply the grievance framework, there is an appearance of sophistication in the analysis. Whether the object of study is the Declaration of Independence, a Tolstoy novel, or a problem in criminology, the same set of ideas about victims, power, and social justice can be applied.