IDEA may indeed reflect dominant cultural values with respect to due process and individuality, however, due process also includes choices with respect to conflict resolution that do provide for a variety of styles. Schools oftentimes deny a student special education services for monetary reasons or by taking a generalized approach to IEPs which is contrary to individualized need of the student. Many communities of color do not avail themselves of their children's due process rights due to the the fact they are not informed of their rights, the continuum of options for placement and services in the least restrictive environment. The philosophy of cultural competence should not be made as a sword against a good and just civil rights law. It is also equally presumptuous to infer that the dominant culture is the only culture that values the concept of due process.
Culture is also something that can change or evolve over time.
Many of the cultures of the world have been oppressed by dominant cultures and due process has not been a reality for many communities. I would hope the learned author would spend some time exploring the roots of our civil rights laws in this country. It has been my experience that although people may seek different strategies to effectuate change, they generally know what is inherently right or inherently wrong. The root of the problem you identify is not of laws, entitlements and due process. It is one of value of difference, acceptance of difference and how to work together while embracing those differences.